Segment Reporting and Geographic Information - Selected Financial Data for Each Reportable Segment (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenue	$ 17,279	$ 15,381	$ 14,619
Operating income (loss)	704	582	464
Depreciation and amortization	716	658	643
Operating Segments \| Transportation
Segment Reporting Information [Line Items]
Revenue	11,343	10,276	9,976
Operating income (loss)	646	547	459
Depreciation and amortization	461	447	456
Operating Segments \| Logistics
Segment Reporting Information [Line Items]
Revenue	6,065	5,229	4,761
Operating income (loss)	216	202	165
Depreciation and amortization	244	203	185
Corporate
Segment Reporting Information [Line Items]
Revenue	0	0	0
Operating income (loss)	(158)	(167)	(160)
Depreciation and amortization	11	8	2
Eliminations
Segment Reporting Information [Line Items]
Revenue	(129)	(124)	(118)
Operating income (loss)	0	0	0
Depreciation and amortization	$ 0	$ 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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