| | | | | | | | | | | | | | | | | | | | | |
<DefinitionAndReference> |
| <Element Id="dei_EntityFilerCategory"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_DebtInstrumentInterestRateStatedPercentage"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansTax"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="xel_RateMattersTextBlock"> |
| | <definition> Describes all of the specific events that have or may impact rates and amortization of regulatory assets and liabilities (for example, pending or recently concluded regulatory proceedings, environmental requirements). Specifics m;ay include quantifications related to rates, costs, and earnings. Events may relate to rate moratoriums or price tags. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_OtherLongTermDebt"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_OtherCostOfOperatingRevenue"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_AllowanceForFundsUsedDuringConstructionInvestingActivities"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="xel_SelectedBalanceSheetDataTextBlock"> |
| | <definition> Details of Certain Balance Sheet Accounts </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="xel_DecommissioningFundInvestmentsAndOtherInvestments"> |
| | <definition> Decommissioning fund investments and other investments. The decommission fund is used to pay for the costs of decontaminating and decommissioning of facilities through collection of revenues derived from utility assessments and government appropriations. Decommission fund investment for the process whereby a power station, at the end of its economic life, is taken permanently out of service and its site made available for other purposes. In the case of a nuclear station this comprises three different states of clearance. Immediately after the final closure, radioactive material such as nuclear fuel and operational waste is removed and the buildings surrounding the reactor shield are dismantled and finally the reactor itself is dismantled. The line item also includes other investments not otherwise specified in the taxonomy. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_ReceivablesNetCurrent"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_ElectricDomesticRegulatedRevenue"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_CashAndCashEquivalentsAtCarryingValue"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="xel_ConservationAndDemandSideManagementProgramExpenses"> |
| | <definition> Costs incurred for energy conservation, weatherization and other programs to conserve or manage energy use by customers. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_PreferredStockSharesOutstanding"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_OtherNonoperatingIncomeExpense"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="xel_IncomeLossFromContinuingOperationsBeforeIncomeTaxesAndMinorityInterest"> |
| | <definition> Sum of operating profit and nonoperating income (expense) before income taxes, extraordinary items, cumulative effects of changes in accounting principles, and noncontrolling interest. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_EquityMethodInvestmentDividendsOrDistributions"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="xel_RegulatoryAssetsAndLiabilitiesTextBlock"> |
| | <definition> Description containing the components of unamortized regulatory assets and liabilities of continuing operations by remaining amortization period as shown on the balance sheets per ASC 980 Regulated Operations. Regulatory assets and liabilities represent amounts that may be collectible from, or required to be paid back to, customers in future gas and electric rates. This element may be used as a single block of text to encapsulate the entire disclosure for regulatory assets and liabilities including data and tables. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_Assets"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_InvestmentTaxCredit"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_NetCashProvidedByUsedInDiscontinuedOperations"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="xel_IncreaseDecreaseInOperatingLiabilitiesCurrent"> |
| | <definition> The net change during the reporting period in other current operating liabilities not otherwise defined in the taxonomy. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_IncreaseDecreaseInDeferredFuelCosts"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_DisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_CumulativeEffectOfInitialAdoptionOfNewAccountingPrinciple"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_InterestExpense"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_ScheduleOfJointlyOwnedUtilityPlantsTextBlock"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_AssetRetirementObligationsNoncurrent"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_PaymentsToAcquireProductiveAssets"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="dei_EntityPublicFloat"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="dei_DocumentPeriodEndDate"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_CapitalExpendituresIncurredButNotYetPaid"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_DebtInstrumentMaturityDate"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_IncreaseDecreaseInRestrictedCash"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_StockIssuedDuringPeriodValueNewIssues"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_FairValueDisclosuresTextBlock"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="dei_EntityCurrentReportingStatus"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_EarningsPerShareDiluted"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="xel_EarlyParticipationPaymentsOnDebtExchange"> |
| | <definition> Expenses incurred related to the exchange of debt instruments with respective investors. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_AccountsPayableCurrent"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_LiabilitiesCurrent"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_CondensedFinancialInformationOfParentCompanyOnlyDisclosureTextBlock"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_OtherLiabilitiesNoncurrent"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationNoncurrent"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_SharesIssued"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_PrepaidExpenseCurrent"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_DebtInstrumentIssuer"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_IncomeTaxesPaidNet"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_CostOfPurchasedOilAndGas"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_ProceedsFromIssuanceOfLongTermDebt"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_CommitmentsAndContingencies2009"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_NetCashProvidedByUsedInFinancingActivities"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_DebtAndCapitalLeaseObligations"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_ProvisionForDoubtfulAccounts"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_DebtInstrumentCarryingAmount"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_CumulativeEffectOfInitialAdoptionOfFIN48"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="xel_IncreaseDecreaseInOperatingAssetsNoncurrent"> |
| | <definition> The net change during the reporting period in other noncurrent operating assets not otherwise defined in the taxonomy. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_QuarterlyFinancialInformationTextBlock"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="dei_DocumentType"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_SignificantAccountingPoliciesTextBlock"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_StockholdersEquityNoteDisclosureTextBlock"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_CommonStockValue"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_Revenues"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_FairValueMeasurementInputsDisclosureTextBlock"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_NetCashProvidedByUsedInOperatingActivities"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_PreferredStockValue"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_OtherIncomeAndOtherExpenseDisclosureTextBlock"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_CapitalLeaseObligationsIncurred"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="xel_NuclearFuelAmortization"> |
| | <definition> The expense charged against earnings for the periodic recognition of costs previously incurred before nuclear fuel is fabricated and loaded. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_IncomeLossFromEquityMethodInvestments"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_IncreaseDecreaseInAccountsPayable"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_OtherLiabilitiesCurrent"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_DerivativeLiabilitiesCurrent"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_PropertyPlantAndEquipmentNet"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_LiabilitiesAndStockholdersEquity"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_InterestAndDebtExpense"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_CommonStockParOrStatedValuePerShare"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_TaxesPayableCurrent"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_IncomeLossFromContinuingOperationsPerBasicShare"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="dei_CurrentFiscalYearEndDate"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_LongTermDebtTextBlock"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_RepaymentsOfLongTermDebt"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_GasDomesticRegulatedRevenue"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_ProfitLoss"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_PreferredStockParOrStatedValuePerShare"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="dei_EntityCentralIndexKey"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_DerivativeAssetsCurrent"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="xel_NuclearObligationsTextBlock"> |
| | <definition> Summarizes the requirements of nuclear fuel storage, disposal and decontamination programs as required by various regulators and governmental entities, which are recovered through customer rates. This can include total estimated, actual and forecasted obligation expenses, which are approved by regulatory authorities periodically. This element may be used as a single block of text to encapsulate the entire disclosure for nuclear obligations including data and tables. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_StockIssuedDuringPeriodSharesNewIssues"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="xel_IssuanceOfCommonStockForSeniorConvertibleNotes"> |
| | <definition> The fair value of stock granted to the holder in exchange for senior convertible notes by the maturity date of the notes. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="xel_CumulativeEffectOfInitialAdoptionOfNewAccountingPrincipleTaxEffect"> |
| | <definition> Tax effect of the cumulative effect of initial adoption of new accounting principle on beginning retained earnings. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="dei_AmendmentFlag"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_CostOfDomesticRegulatedElectric"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_CostsAndExpenses"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_PreferredStockSharesAuthorized"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_SegmentReportingDisclosureTextBlock"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_CommonStockSharesAuthorized"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="xel_IssuanceOfCommonStockForReinvestedDividendsAnd401kPlans"> |
| | <definition> The fair value of stock or stock options granted to stockholders who choose to have dividends reinvested in the company's stock and the fair value of stock granted to employees as a contribution to the employees' 401(k) plans. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_DepreciationAmortizationAndAccretionNet"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_PaymentsToAcquireEquityMethodInvestments"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_CashAcquiredFromAcquisition"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecrease"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_OperatingIncomeLoss"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_PreferredStockDividends"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="xel_DepreciationAmortizationAndAccretionNetCashFlowImpact"> |
| | <definition> The cash flow impact of the aggregate net amount of depreciation, amortization, and accretion recognized during an accounting period. As a noncash item, the net amount is added back to net income when calculating cash provided by (used in) operations using the indirect method. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_IncreaseDecreaseInUnbilledReceivables"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_DividendsCommonStock"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_DebtInstrumentUnamortizedDiscount"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="xel_IncreaseDecreaseInOperatingLiabilitiesNoncurrent"> |
| | <definition> The net change during the reporting period in other noncurrent operating liabilities not otherwise defined in the taxonomy. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_DividendsPayableCurrent"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_RegulatoryAssetsNoncurrent"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_OtherSalesRevenueNet"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_TaxesExcludingIncomeAndExciseTaxes"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_CustomerAdvancesForConstruction"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_ShareBasedCompensation"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_PaymentsOfDividends"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_AmortizationOfRegulatoryAsset"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_PaymentsToInvestInDecommissioningFund"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_PaymentsForProceedsFromInvestments"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_DerivativeAssetsNoncurrent"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_AccumulatedDeferredInvestmentTaxCredit"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_ShortTermBorrowings"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxEffectPeriodIncreaseDecrease"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_AssetsCurrent"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="xel_OtherAssetsExcludingPropertyPlantAndEquipment"> |
| | <definition> Sum of the carrying amounts as of the balance sheet date of all assets, excluding net property, plant and equipment, that are expected to be realized in cash, sold or consumed after one year or beyond the normal operating cycle, if longer. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_IncomeTaxExpenseBenefit"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_IncomeTaxDisclosureTextBlock"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_ShortTermDebtTextBlock"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_InventoryNet"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="xel_IncreaseDecreaseInOperatingAssetsCurrent"> |
| | <definition> The net change during the reporting period in other current operating assets not otherwise defined in the taxonomy. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_InterestPayableCurrent"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_IncreaseDecreaseInRegulatoryAssetsAndLiabilities"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_ComprehensiveIncomeNetOfTax"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_DerivativeLiabilitiesNoncurrent"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_DebtInstrumentDescription"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_ProceedsFromRepaymentsOfShortTermDebt"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_ProceedsFromDecommissioningFund"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_OtherAssetsNoncurrent"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_PropertyPlantAndEquipmentScheduleOfSignificantAcquisitionsAndDisposalsTextBlock"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="xel_DeferredCreditsAndOtherLiabilities"> |
| | <definition> Total obligations, excluding Long-Term Debt, incurred as part of normal operations that is expected to be repaid beyond the following twelve months or one business cycle. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_OtherCostAndExpenseOperating"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_CommonStockDividendsPerShareDeclared"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_DeferredFuelCost"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_LongTermDebtAndCapitalLeaseObligations"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_NetCashProvidedByUsedInInvestingActivities"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_RegulatoryLiabilityNoncurrent"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="dei_EntityRegistrantName"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_InterestPaidNet"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="xel_CommonShareholdersEquity"> |
| | <definition> Total of all Stockholders' Equity items other than those pertaining to Preferred Stock. Includes the following: Common Stock at Par, Common Stock Additional Paid-in Capital, Retained Earnings, and Accumulated Other Comprehensive Income (Loss). </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_IncreaseDecreaseInInventories"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="dei_EntityWellKnownSeasonedIssuer"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_RetainedEarningsAccumulatedDeficit"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="dei_EntityVoluntaryFilers"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="xel_AccruedUnbilledRevenues"> |
| | <definition> The amount of fees and other revenue, excluding investment income receivable, earned but not yet received, which were recognized in conformity with revenue recognition criteria based on estimates or specific contractual terms. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_AdditionalPaidInCapital"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_DeferredIncomeTaxExpenseBenefit"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_EarningsPerShareBasic"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_DeferredTaxLiabilitiesNoncurrent"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="dei_EntityCommonStockSharesOutstanding"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_ProceedsFromIssuanceOfCommonStock"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| <Element Id="us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest"> |
| | <definition> No authoritative reference available. </definition> |
| | <reference> No authoritative reference available. </reference> |
| | </Element> |
| </DefinitionAndReference> |