Pension Plans, Postretirement and Other Employee Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
U.S. | Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost — benefits earned during the period	$ 1	$ 1	$ 1	$ 1
Interest cost	3	2	8	7
Expected return on plan assets	(4)	(4)	(11)	(11)
Settlement loss		6	0	6
Net amortization:
Actuarial loss	1	1	3	4
Prior service credit	0	0	0	0
Net pension and postretirement costs	1	0	1	7
U.S. | Postretirement
Defined Benefit Plan Disclosure [Line Items]
Service cost — benefits earned during the period	0	0	0	0
Interest cost	2	1	5	4
Expected return on plan assets	0	0	0	0
Settlement loss			0	0
Net amortization:
Actuarial loss	2	2	6	5
Prior service credit	0	0	(1)	(1)
Net pension and postretirement costs	4	3	10	8
Foreign | Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost — benefits earned during the period	3	3	8	7
Interest cost	3	4	9	10
Expected return on plan assets	(5)	(4)	(15)	(19)
Settlement loss			0	0
Net amortization:
Actuarial loss	2	1	6	6
Prior service credit	0	1	0	1
Net pension and postretirement costs	$ 3	$ 5	$ 8	$ 5