Pension Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Pension Benefit Plans
Amortization:
Settlements	$ 5	$ 0	$ 5	$ 8
Decrease in benefit liability	46		46
Postretirement Benefits Other Than Pensions | U.S.
Amortization:
Decrease in benefit liability		32
Funded Plan | Pension Benefit Plans | U.S.
Components of net periodic pension cost
Service cost	3	3	9	9
Interest cost	10	12	30	37
Expected asset return	(21)	(19)	(63)	(60)
Amortization:
Amortization of actuarial loss	16	14	48	42
Net periodic pension cost	8	10	24	28
Funded Plan | Pension Benefit Plans | Non-U.S. Pension Plans
Components of net periodic pension cost
Service cost	3	3	9	10
Interest cost	5	6	15	19
Expected asset return	(11)	(12)	(34)	(36)
Amortization:
Amortization of actuarial loss	$ 3	$ 3	$ 10	9
Net periodic pension cost				$ 2