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Goodwill (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Changes in goodwill
Beginning Balance	$ 2,521
Foreign currency translation adjustments	16
Ending Balance	2,537
Goodwill impairment	0
Operating Segments | Transportation
Changes in goodwill
Beginning Balance	1,040
Foreign currency translation adjustments	10
Ending Balance	1,050
Operating Segments | Facilities
Changes in goodwill
Beginning Balance	978
Foreign currency translation adjustments	4
Ending Balance	982
Operating Segments | Supply and Logistics
Changes in goodwill
Beginning Balance	503
Foreign currency translation adjustments	2
Ending Balance	$ 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.

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