Pension Plans, Postretirement and Other Employee Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Curtailment loss (gain)	$ (21)
Settlement loss	(6)
Pension Plans | U.S.
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	$ 2	$ 1
Interest cost	41	53	21
Expected return on plan assets	(64)	(67)	(28)
Curtailment loss (gain)	0	0	0
Settlement loss	1	6	1
Net Amortization [Abstract]
Actuarial loss	6	5	5
Prior service cost (credit)	0	0	0
Net periodic costs	(15)	(1)	0
Pension Plans | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Service cost	25	24	14
Interest cost	18	24	15
Expected return on plan assets	(17)	(19)	(18)
Curtailment loss (gain)	0	0	0
Settlement loss	6	1	3
Net Amortization [Abstract]
Actuarial loss	8	5	6
Prior service cost (credit)	0	1	1
Net periodic costs	40	36	21
Other Postretirement Benefits Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	1	0
Interest cost	9	13	8
Expected return on plan assets	0	0	0
Curtailment loss (gain)	(21)	(7)	1
Settlement loss	0	0	0
Net Amortization [Abstract]
Actuarial loss	2	4	5
Prior service cost (credit)	(7)	(8)	0
Net periodic costs	$ (17)	$ 3	$ 14