Pension Plans, Postretirement and Other Employee Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
US | Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 1
Interest cost	10	13
Expected return on plan assets	(16)	(17)
Net amortization:
Actuarial loss	2	1
Prior service cost (credit)	0	0
Net pension and postretirement costs (credits)	(4)	(2)
US | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	2	3
Expected return on plan assets	0	0
Net amortization:
Actuarial loss	1	1
Prior service cost (credit)	(2)	(2)
Net pension and postretirement costs (credits)	1	2
Non-U.S. | Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	6	6
Interest cost	4	7
Expected return on plan assets	(4)	(5)
Net amortization:
Actuarial loss	2	1
Prior service cost (credit)	0	0
Net pension and postretirement costs (credits)	$ 8	$ 9