Goodwill (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2020
Changes in goodwill
Beginning Balance		$ 2,540	$ 2,540
Acquisitions			2
Foreign currency translation adjustments			(18)
Goodwill, gross	$ 2,524		2,524
Impairments	0		(2,515)
Foreign currency translation adjustment, accumulated impairment			(9)
Accumulated impairment losses	(2,524)		(2,524)
Ending Balance	0		0
Operating Segments \| Transportation
Changes in goodwill
Beginning Balance		1,052	1,052
Acquisitions			2
Foreign currency translation adjustments			(11)
Goodwill, gross	1,043		1,043
Impairments			(1,038)
Foreign currency translation adjustment, accumulated impairment			(5)
Accumulated impairment losses	(1,043)		(1,043)
Ending Balance	0		0
Operating Segments \| Facilities
Changes in goodwill
Beginning Balance		982	982
Foreign currency translation adjustments			(4)
Goodwill, gross	978		978
Impairments			(975)
Foreign currency translation adjustment, accumulated impairment			(3)
Accumulated impairment losses	(978)		(978)
Ending Balance	0		0
Operating Segments \| Supply and Logistics
Changes in goodwill
Beginning Balance		$ 506	506
Foreign currency translation adjustments			(3)
Goodwill, gross	503		503
Impairments			(502)
Foreign currency translation adjustment, accumulated impairment			(1)
Accumulated impairment losses	(503)		(503)
Ending Balance	$ 0		$ 0
Level 3 \| Valuation Technique, Discounted Cash Flow
Goodwill
Goodwill impairment analysis, projected cash flows, period		6 years
Level 3 \| Valuation Technique, Discounted Cash Flow \| Measurement Input, Discount Rate
Goodwill
Goodwill impairment analysis, discount rate, cost of capital, theoretical market participant		14.00%

Goodwill Accumulated Impairment, Foreign Currency Translation Gain (Loss)

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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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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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