Segment Reporting and Geographic Information - Selected Financial Data for Each Reportable Segment (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenue	$ 16,648	$ 17,279	$ 15,381
Operating income (loss)	821	704	582
Depreciation, amortization and net lease activity	739	716	658
Operating Segments \| Transportation
Segment Reporting Information [Line Items]
Revenue	10,687	11,343	10,276
Operating income (loss)	752	646	547
Depreciation, amortization and net lease activity	447	461	447
Operating Segments \| Logistics
Segment Reporting Information [Line Items]
Revenue	6,093	6,065	5,229
Operating income (loss)	241	216	202
Depreciation, amortization and net lease activity	277	244	203
Corporate
Segment Reporting Information [Line Items]
Revenue	0	0	0
Operating income (loss)	(172)	(158)	(167)
Depreciation, amortization and net lease activity	15	11	8
Eliminations
Segment Reporting Information [Line Items]
Revenue	(132)	(129)	(124)
Operating income (loss)	0	0	0
Depreciation, amortization and net lease activity	$ 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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