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Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Changes in goodwill
Balance at beginning of period	$ 2,521	$ 2,566
Foreign currency translation adjustments	19	(32)
Divestitures		(13)
Balance at end of period	2,540	2,521
Operating Segments | Transportation
Changes in goodwill
Balance at beginning of period	1,040	1,070
Foreign currency translation adjustments	12	(19)
Divestitures		(11)
Balance at end of period	1,052	1,040
Operating Segments | Facilities
Changes in goodwill
Balance at beginning of period	978	988
Foreign currency translation adjustments	4	(8)
Divestitures		(2)
Balance at end of period	982	978
Operating Segments | Supply And Logistics
Changes in goodwill
Balance at beginning of period	503	508
Foreign currency translation adjustments	3	(5)
Balance at end of period	$ 506	$ 503

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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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

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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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