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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	1	2	4	7
Expected return on plan assets	0	0	0	0
Settlement loss	0	0	0	0
Curtailment gain	0	(21)	0	(21)
Net amortization:
Actuarial loss	1	1	2	2
Prior service cost (credit)	(2)	(3)	(7)	(7)
Net pension and postretirement costs (credits)	0	(21)	(1)	(19)
U.S. | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	1	1
Interest cost	9	11	24	31
Expected return on plan assets	(17)	(16)	(49)	(48)
Settlement loss	0	0	0	0
Curtailment gain	0	0	0	0
Net amortization:
Actuarial loss	3	1	9	4
Prior service cost (credit)	0	0	0	0
Net pension and postretirement costs (credits)	(5)	(4)	(15)	(12)
Non-U.S. | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	8	7	21	19
Interest cost	4	4	13	13
Expected return on plan assets	(4)	(5)	(12)	(13)
Settlement loss	0	5	0	5
Curtailment gain	0	0	0	0
Net amortization:
Actuarial loss	1	3	6	7
Prior service cost (credit)	0	0	0	0
Net pension and postretirement costs (credits)	$ 9	$ 14	$ 28	$ 31