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Goodwill (Details)	9 Months Ended
	Sep. 30, 2018 USD ($)
Changes in goodwill
Beginning Balance	$ 2,566,000,000
Foreign currency translation adjustments	(13,000,000)
Dispositions	(13,000,000)
Ending Balance	2,540,000,000
Goodwill impairment	0
Operating Segments | Transportation
Changes in goodwill
Beginning Balance	1,070,000,000
Foreign currency translation adjustments	(8,000,000)
Dispositions	(10,000,000)
Ending Balance	1,052,000,000
Operating Segments | Facilities
Changes in goodwill
Beginning Balance	988,000,000
Foreign currency translation adjustments	(3,000,000)
Dispositions	(3,000,000)
Ending Balance	982,000,000
Operating Segments | Supply and Logistics
Changes in goodwill
Beginning Balance	508,000,000
Foreign currency translation adjustments	(2,000,000)
Ending Balance	$ 506,000,000

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- 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.

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