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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
US | Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost — benefits earned during the period	$ 1	$ 1	$ 1	$ 1
Interest cost	2	4	7	13
Expected return on plan assets	(4)	(6)	(11)	(18)
Settlement loss			6	0
Net amortization:
Actuarial loss	1	2	4	6
Prior service cost (credit)	0	0	0	0
Net pension and postretirement costs	0	1	7	2
US | Postretirement
Defined Benefit Plan Disclosure [Line Items]
Service cost — benefits earned during the period	0	0	0	0
Interest cost	1	1	4	4
Expected return on plan assets	0	0	0	0
Settlement loss			0	0
Net amortization:
Actuarial loss	2	2	5	4
Prior service cost (credit)	0	(1)	(1)	(1)
Net pension and postretirement costs	3	2	8	7
Foreign | Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost — benefits earned during the period	3	2	7	6
Interest cost	4	4	10	11
Expected return on plan assets	(4)	(5)	(19)	(15)
Settlement loss			0	0
Net amortization:
Actuarial loss	1	1	6	5
Prior service cost (credit)	1	1	1	1
Net pension and postretirement costs	$ 5	$ 3	$ 5	$ 8