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<?xml version="1.0" encoding="windows-1252"?> |
<ownershipDocument> |
| <schemaVersion> X0407 </schemaVersion> |
| <documentType> 4 </documentType> |
| <periodOfReport> 2023-05-31 </periodOfReport> |
| <issuer> |
| | <issuerCik> 0001364742 </issuerCik> |
| | <issuerName> BlackRock Inc. </issuerName> |
| | <issuerTradingSymbol> BLK </issuerTradingSymbol> |
| | </issuer> |
| <reportingOwner> |
| | <reportingOwnerId> |
| | | <rptOwnerCik> 0001961019 </rptOwnerCik> |
| | | <rptOwnerName> Heller Caroline </rptOwnerName> |
| | | </reportingOwnerId> |
| | <reportingOwnerAddress> |
| | | <rptOwnerStreet1> BLACKROCK, INC. </rptOwnerStreet1> |
| | | <rptOwnerStreet2> 50 HUDSON YARDS </rptOwnerStreet2> |
| | | <rptOwnerCity> NEW YORK </rptOwnerCity> |
| | | <rptOwnerState> NY </rptOwnerState> |
| | | <rptOwnerZipCode> 10001 </rptOwnerZipCode> |
| | | <rptOwnerStateDescription></rptOwnerStateDescription> |
| | | </reportingOwnerAddress> |
| | <reportingOwnerRelationship> |
| | | <isOfficer> 1 </isOfficer> |
| | | <officerTitle> Senior Managing Director </officerTitle> |
| | | </reportingOwnerRelationship> |
| | </reportingOwner> |
| <aff10b5One> 0 </aff10b5One> |
| <nonDerivativeTable> |
| | <nonDerivativeTransaction> |
| | | <securityTitle> |
| <value> Common Stock </value> |
| </securityTitle> |
| | | <transactionDate> |
| <value> 2023-05-31 </value> |
| </transactionDate> |
| | | <transactionCoding> |
| <transactionFormType> 4 </transactionFormType> |
| <transactionCode> F </transactionCode> |
| <equitySwapInvolved> 0 </equitySwapInvolved> |
| </transactionCoding> |
| | | <transactionTimeliness></transactionTimeliness> |
| | | <transactionAmounts> |
| <transactionShares> |
| <value> 101 </value> |
| <footnoteId id="F1"/> |
| </transactionShares> |
| <transactionPricePerShare> |
| <value> 673.58 </value> |
| </transactionPricePerShare> |
| <transactionAcquiredDisposedCode> |
| <value> D </value> |
| </transactionAcquiredDisposedCode> |
| </transactionAmounts> |
| | | <postTransactionAmounts> |
| <sharesOwnedFollowingTransaction> |
| <value> 1654 </value> |
| <footnoteId id="F2"/> |
| </sharesOwnedFollowingTransaction> |
| </postTransactionAmounts> |
| | | <ownershipNature> |
| <directOrIndirectOwnership> |
| <value> D </value> |
| </directOrIndirectOwnership> |
| </ownershipNature> |
| | | </nonDerivativeTransaction> |
| | </nonDerivativeTable> |
| <footnotes> |
| | <footnote id="F1"> Represents the withholding by BlackRock of common stock to satisfy tax obligations on the vesting of the reporting person's awards granted under the Second Amended and Restated BlackRock, Inc. 1999 Stock Award and Incentive Plan. </footnote> |
| | <footnote id="F2"> Includes Common Stock as well as Restricted Stock Units that will vest over a period of 1 to 3 years. Each Restricted Stock Unit is payable solely by delivery of an equal number of shares of Common Stock. </footnote> |
| | </footnotes> |
| <ownerSignature> |
| | <signatureName> /s/ R. Andrew Dickson III as Attorney-in-Fact for Caroline Heller </signatureName> |
| | <signatureDate> 2023-06-02 </signatureDate> |
| | </ownerSignature> |
| </ownershipDocument> |