Revenue Recognition - Disaggregation of Revenue by Products and Services (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue, excluding assessed taxes	$ 3,502	$ 4,238	$ 7,366	$ 8,358
Total revenue	3,502	4,238	7,366	8,358
Eliminations/Other
Disaggregation of Revenue [Line Items]
Revenue, excluding assessed taxes	(29)	(35)	(61)	(68)
Total revenue	(29)	(35)	(61)	(68)
Transportation
Disaggregation of Revenue [Line Items]
Revenue, excluding assessed taxes	2,127	2,747	4,586	5,406
Transportation | Freight brokerage and truckload
Disaggregation of Revenue [Line Items]
Revenue, excluding assessed taxes	818	1,094	1,841	2,186
Transportation | LTL
Disaggregation of Revenue [Line Items]
Revenue, excluding assessed taxes	979	1,261	2,114	2,440
Transportation | Last mile
Disaggregation of Revenue [Line Items]
Revenue, excluding assessed taxes	218	212	419	436
Transportation | Managed transportation
Disaggregation of Revenue [Line Items]
Revenue, excluding assessed taxes	74	142	157	266
Transportation | Global forwarding
Disaggregation of Revenue [Line Items]
Revenue, including assessed taxes	76	78	137	155
Transportation | Eliminations/Other
Disaggregation of Revenue [Line Items]
Revenue, excluding assessed taxes	(38)	(40)	(82)	(77)
Logistics
Disaggregation of Revenue [Line Items]
Revenue, excluding assessed taxes	$ 1,404	$ 1,526	$ 2,841	$ 3,020