Postretirement Benefit Plans (Components of Pension Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other changes in plan assets and benefit obligations recognized in other comprehensive income
Net loss	$ (51)	$ 78	$ 83
Prior service cost	0	5	0
Settlement	0	0	(9)
Total recognized in comprehensive income	2	(2)	0
Defined benefit pension plans
Net periodic benefit cost:
Net periodic benefit cost	31	31	19
Other changes in plan assets and benefit obligations recognized in other comprehensive income
Change recognized in other comprehensive income	(83)	79	69
Total recognized in comprehensive income	(52)	110	88
United States
Net periodic benefit cost:
Service cost	3	3	3
Interest cost	3	3	4
Expected return on plan assets	(7)	(7)	(8)
Amortization of net actuarial loss	4	3	1
Net periodic benefit cost	3	2	0
Other changes in plan assets and benefit obligations recognized in other comprehensive income
Net loss	0	3	6
Amortization of net actuarial loss	(4)	(3)	(1)
Change recognized in other comprehensive income	(4)	0	5
International defined benefit pension plans
Net periodic benefit cost:
Service cost	14	13	9
Interest cost	11	16	19
Expected return on plan assets	(14)	(14)	(27)
Amortization of net actuarial loss	17	14	9
Settlement	0	0	9
Net periodic benefit cost	28	29	19
Other changes in plan assets and benefit obligations recognized in other comprehensive income
Net loss	(51)	74	79
Amortization of net actuarial loss	(17)	(14)	(9)
Settlement	0	0	(9)
Foreign Exchange	(11)	19	3
Change recognized in other comprehensive income	$ (79)	$ 79	$ 64