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Goodwill (Details) $ in Millions	6 Months Ended
	Jun. 30, 2016 USD ($)
Changes in goodwill
Balance at beginning of period	$ 2,405
Foreign currency translation adjustments	22
Dispositions	(31)
Balance at end of period	2,396
Impairment of goodwill	0
Transportation
Changes in goodwill
Balance at beginning of period	815
Foreign currency translation adjustments	14
Dispositions	(15)
Balance at end of period	814
Facilities
Changes in goodwill
Balance at beginning of period	1,087
Foreign currency translation adjustments	6
Dispositions	(16)
Balance at end of period	1,077
Supply and Logistics
Changes in goodwill
Balance at beginning of period	503
Foreign currency translation adjustments	2
Balance at end of period	$ 505

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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-Publisher FASB
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-Paragraph 1
-Subparagraph (f)
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- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
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-Subparagraph (b)
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Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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