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Goodwill (Details) - USD ($)		9 Months Ended
	Jun. 30, 2016	Sep. 30, 2016
Changes in goodwill
Balance at December 31, 2015		$ 2,405,000,000
Foreign currency translation adjustments		19,000,000
Dispositions and reclassifications to assets held for sale		(71,000,000)
Balance at September 30, 2016		2,353,000,000
Impairment of goodwill	$ 0
Operating Segments | Transportation
Changes in goodwill
Balance at December 31, 2015		815,000,000
Foreign currency translation adjustments		12,000,000
Dispositions and reclassifications to assets held for sale		(15,000,000)
Balance at September 30, 2016		812,000,000
Operating Segments | Facilities
Changes in goodwill
Balance at December 31, 2015		1,087,000,000
Foreign currency translation adjustments		5,000,000
Dispositions and reclassifications to assets held for sale		(56,000,000)
Balance at September 30, 2016		1,036,000,000
Operating Segments | Supply and Logistics
Changes in goodwill
Balance at December 31, 2015		503,000,000
Foreign currency translation adjustments		2,000,000
Balance at September 30, 2016		$ 505,000,000

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)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-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
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 2
-Subparagraph (b)
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-Publisher FASB
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- Definition

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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