Pension and Other Postretirement Benefits - Components (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 0	$ 1	$ 2	$ 3
Recognized prior service credit	(6)	(8)	(19)	(25)
Recognized net loss	1	0	3	2
Net periodic cost (benefit)	(5)	(7)	(14)	(20)
U.S. | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	4	2	14	10
Interest cost	9	13	28	39
Expected return on plan assets	(18)	(17)	(55)	(52)
Recognized prior service credit	1	1	1	1
Recognized net loss	14	14	42	42
Net periodic cost (benefit)	10	13	30	40
Pension Benefits - Non-U.S. Plans | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	2	9	10
Interest cost	14	15	41	54
Expected return on plan assets	(26)	(31)	(79)	(100)
Pension settlements and curtailments	0	0	0	(14)
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement	5	6	61	37
Recognized prior service credit	0	0	0	(1)
Recognized net loss	5	7	18	26
Net periodic cost (benefit)	$ 1	$ (1)	$ 50	$ 12