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Goodwill (Details)	6 Months Ended
	Jun. 30, 2018 USD ($)
Changes in goodwill
Beginning Balance	$ 2,566,000,000
Foreign currency translation adjustments	(19,000,000)
Dispositions and reclassifications to assets held for sale	(12,000,000)
Ending Balance	2,535,000,000
Goodwill impairment	0
Operating Segments | Transportation
Changes in goodwill
Beginning Balance	1,070,000,000
Foreign currency translation adjustments	(11,000,000)
Dispositions and reclassifications to assets held for sale	(9,000,000)
Ending Balance	1,050,000,000
Operating Segments | Facilities
Changes in goodwill
Beginning Balance	988,000,000
Foreign currency translation adjustments	(5,000,000)
Dispositions and reclassifications to assets held for sale	(3,000,000)
Ending Balance	980,000,000
Operating Segments | Supply and Logistics
Changes in goodwill
Beginning Balance	508,000,000
Foreign currency translation adjustments	(3,000,000)
Ending Balance	$ 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.

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