Segment Reporting - Selected Financial Data for Each of Operating Segments (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Revenue	$ 3,864	$ 4,120
Operating income (loss)	81	132
Depreciation and amortization	183	180
Operating Segments \| Transportation
Segment Reporting Information [Line Items]
Revenue	2,459	2,659
Operating income (loss)	120	128
Depreciation and amortization	110	116
Operating Segments \| Logistics
Segment Reporting Information [Line Items]
Revenue	1,437	1,494
Operating income (loss)	38	46
Depreciation and amortization	69	61
Corporate
Segment Reporting Information [Line Items]
Revenue	0	0
Operating income (loss)	(77)	(42)
Depreciation and amortization	4	3
Eliminations/Other
Segment Reporting Information [Line Items]
Revenue	(32)	(33)
Operating income (loss)	0	0
Depreciation and amortization	$ 0	$ 0

The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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