Pension Plans, Postretirement and Other Employee Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0
Interest cost	1	2
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)	0	1
U.S. | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	8	10
Expected return on plan assets	(16)	(16)
Net amortization:
Actuarial loss	3	2
Prior service cost (credit)	0	0
Net pension and postretirement costs (credits)	(5)	(4)
Non-U.S. | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	7	6
Interest cost	4	4
Expected return on plan assets	(4)	(4)
Net amortization:
Actuarial loss	2	2
Prior service cost (credit)	0	0
Net pension and postretirement costs (credits)	$ 9	$ 8