Pension Plans, Postretirement and Other Employee Benefits - Amounts to be Reflected as Component of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Pension Plans | U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net actuarial loss	$ 275	$ 230
Prior service cost	1	0
Total	276	230
Pension Plans | Non-U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net actuarial loss	136	145
Prior service cost	3	3
Total	139	148
Other Postretirement Benefits Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net actuarial loss	29	34
Prior service cost	(91)	(70)
Total	$ (62)	$ (36)