Revenue Recognition - Disaggregation of Revenue by Products and Services (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue, excluding assessed taxes	$ 4,221	$ 4,154	$ 11,587	$ 12,512
Total revenue	4,221	4,154	11,587	12,512
Eliminations/Other
Disaggregation of Revenue [Line Items]
Revenue, excluding assessed taxes	(34)	(40)	(95)	(108)
Total revenue	(34)	(40)	(95)	(108)
Transportation | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue, excluding assessed taxes	2,675	2,684	7,261	8,090
Total revenue	2,675	2,684	7,261	8,090
Transportation | Operating Segments | Freight brokerage and truckload
Disaggregation of Revenue [Line Items]
Revenue, excluding assessed taxes	1,129	1,083	2,970	3,269
Transportation | Operating Segments | LTL
Disaggregation of Revenue [Line Items]
Revenue, excluding assessed taxes	1,175	1,227	3,289	3,667
Transportation | Operating Segments | Last mile
Disaggregation of Revenue [Line Items]
Revenue, excluding assessed taxes	243	219	662	655
Transportation | Operating Segments | Managed transportation
Disaggregation of Revenue [Line Items]
Revenue, excluding assessed taxes	96	134	253	400
Transportation | Operating Segments | Global forwarding
Disaggregation of Revenue [Line Items]
Revenue, including assessed taxes	75	74	212	229
Transportation | Eliminations/Other
Disaggregation of Revenue [Line Items]
Revenue, excluding assessed taxes	(43)	(53)	(125)	(130)
Logistics | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue, excluding assessed taxes	1,580	1,510	4,421	4,530
Total revenue	$ 1,580	$ 1,510	$ 4,421	$ 4,530