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| | | <ElementDefenition> Carrying amount as of the balance sheet date, which is the cumulative amount paid, adjusted for any amortization recognized prior to adoption of FAS 142 and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions. </ElementDefenition> |
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| | | <Unit> Monetary </Unit> |
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| | | <ElementDefenition> The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation. </ElementDefenition> |
| | | <ElementReferences> Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph e(1) </ElementReferences> |
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| | | <Label> Acquisition of BNSF </Label> |
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| | | <IsBaseElement> false </IsBaseElement> |
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| | | <PeriodType> duration </PeriodType> |
| | | <ShortDefinition> The change during the reporting period in the carrying value of goodwill, excluding goodwill acquired in the period. The... </ShortDefinition> |
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| | | <ElementDefenition> The change during the reporting period in the carrying value of goodwill, excluding goodwill acquired in the period. The change could be the result of goodwill impairment during the period, goodwill written off related to the sale of a business or other adjustments to goodwill. </ElementDefenition> |
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| | | <ElementReferences> Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 43 </ElementReferences> |
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| <ExchangeRateRoundingLevel> UnKnown </ExchangeRateRoundingLevel> |
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