Revenue Recognition - Disaggregation of Revenue by Geographical Area (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 3,864	$ 4,120
United States
Disaggregation of Revenue [Line Items]
Revenue	2,229	2,388
North America (excluding United States)
Disaggregation of Revenue [Line Items]
Revenue	85	85
France
Disaggregation of Revenue [Line Items]
Revenue	458	528
United Kingdom
Disaggregation of Revenue [Line Items]
Revenue	495	505
Europe (excluding France and United Kingdom)
Disaggregation of Revenue [Line Items]
Revenue	571	589
Other
Disaggregation of Revenue [Line Items]
Revenue	26	25
Eliminations/Other
Disaggregation of Revenue [Line Items]
Revenue	(32)	(33)
Eliminations/Other | United States
Disaggregation of Revenue [Line Items]
Revenue	(9)	(5)
Eliminations/Other | North America (excluding United States)
Disaggregation of Revenue [Line Items]
Revenue	0	0
Eliminations/Other | France
Disaggregation of Revenue [Line Items]
Revenue	(3)	(5)
Eliminations/Other | United Kingdom
Disaggregation of Revenue [Line Items]
Revenue	(16)	(18)
Eliminations/Other | Europe (excluding France and United Kingdom)
Disaggregation of Revenue [Line Items]
Revenue	(3)	(4)
Eliminations/Other | Other
Disaggregation of Revenue [Line Items]
Revenue	(1)	(1)
Transportation
Disaggregation of Revenue [Line Items]
Revenue	2,459	2,659
Transportation | United States
Disaggregation of Revenue [Line Items]
Revenue	1,702	1,836
Transportation | North America (excluding United States)
Disaggregation of Revenue [Line Items]
Revenue	71	67
Transportation | France
Disaggregation of Revenue [Line Items]
Revenue	311	364
Transportation | United Kingdom
Disaggregation of Revenue [Line Items]
Revenue	182	188
Transportation | Europe (excluding France and United Kingdom)
Disaggregation of Revenue [Line Items]
Revenue	188	201
Transportation | Other
Disaggregation of Revenue [Line Items]
Revenue	5	3
Transportation | Eliminations/Other
Disaggregation of Revenue [Line Items]
Revenue	(44)	(37)
Logistics
Disaggregation of Revenue [Line Items]
Revenue	1,437	1,494
Logistics | United States
Disaggregation of Revenue [Line Items]
Revenue	536	557
Logistics | North America (excluding United States)
Disaggregation of Revenue [Line Items]
Revenue	14	18
Logistics | France
Disaggregation of Revenue [Line Items]
Revenue	150	169
Logistics | United Kingdom
Disaggregation of Revenue [Line Items]
Revenue	329	335
Logistics | Europe (excluding France and United Kingdom)
Disaggregation of Revenue [Line Items]
Revenue	386	392
Logistics | Other
Disaggregation of Revenue [Line Items]
Revenue	$ 22	$ 23