Goodwill (Details) $ in Millions	6 Months Ended
Jun. 30, 2017 USD ($)
Changes in goodwill
Beginning Balance	$ 2,344
Acquisitions	271
Foreign currency translation adjustments	14
Dispositions and reclassifications to assets held for sale	(33)
Ending Balance	2,596
Operating Segments \| Transportation
Changes in goodwill
Beginning Balance	806
Acquisitions	271
Foreign currency translation adjustments	8
Ending Balance	1,085
Operating Segments \| Facilities
Changes in goodwill
Beginning Balance	1,034
Foreign currency translation adjustments	4
Dispositions and reclassifications to assets held for sale	(33)
Ending Balance	1,005
Operating Segments \| Supply and Logistics
Changes in goodwill
Beginning Balance	504
Foreign currency translation adjustments	2
Ending Balance	$ 506

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.

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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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.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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.

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