Revenue Recognition - Disaggregation of Revenue by Geographical Area (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue	$ 16,648	$ 17,279	$ 15,381
United States
Disaggregation of Revenue [Line Items]
Revenue	9,759	10,232	9,163
North America (excluding United States)
Disaggregation of Revenue [Line Items]
Revenue	323	341	298
France
Disaggregation of Revenue [Line Items]
Revenue	2,005	2,165	2,006
United Kingdom
Disaggregation of Revenue [Line Items]
Revenue	2,076	2,070	1,799
Europe (excluding France and United Kingdom)
Disaggregation of Revenue [Line Items]
Revenue	2,376	2,359	1,930
Other
Disaggregation of Revenue [Line Items]
Revenue	109	112	$ 185
Eliminations
Disaggregation of Revenue [Line Items]
Revenue	(132)	(129)
Eliminations | United States
Disaggregation of Revenue [Line Items]
Revenue	(33)	(19)
Eliminations | North America (excluding United States)
Disaggregation of Revenue [Line Items]
Revenue	0	0
Eliminations | France
Disaggregation of Revenue [Line Items]
Revenue	(12)	(18)
Eliminations | United Kingdom
Disaggregation of Revenue [Line Items]
Revenue	(68)	(70)
Eliminations | Europe (excluding France and United Kingdom)
Disaggregation of Revenue [Line Items]
Revenue	(16)	(18)
Eliminations | Other
Disaggregation of Revenue [Line Items]
Revenue	(3)	(4)
Transportation
Disaggregation of Revenue [Line Items]
Revenue	10,687	11,343
Transportation | United States
Disaggregation of Revenue [Line Items]
Revenue	7,454	8,055
Transportation | North America (excluding United States)
Disaggregation of Revenue [Line Items]
Revenue	286	274
Transportation | France
Disaggregation of Revenue [Line Items]
Revenue	1,358	1,496
Transportation | United Kingdom
Disaggregation of Revenue [Line Items]
Revenue	760	704
Transportation | Europe (excluding France and United Kingdom)
Disaggregation of Revenue [Line Items]
Revenue	810	793
Transportation | Other
Disaggregation of Revenue [Line Items]
Revenue	19	21
Transportation | Eliminations
Disaggregation of Revenue [Line Items]
Revenue	(179)	(145)
Logistics
Disaggregation of Revenue [Line Items]
Revenue	6,093	6,065
Logistics | United States
Disaggregation of Revenue [Line Items]
Revenue	2,338	2,196
Logistics | North America (excluding United States)
Disaggregation of Revenue [Line Items]
Revenue	37	67
Logistics | France
Disaggregation of Revenue [Line Items]
Revenue	659	687
Logistics | United Kingdom
Disaggregation of Revenue [Line Items]
Revenue	1,384	1,436
Logistics | Europe (excluding France and United Kingdom)
Disaggregation of Revenue [Line Items]
Revenue	1,582	1,584
Logistics | Other
Disaggregation of Revenue [Line Items]
Revenue	$ 93	$ 95