Pension and Other Postretirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 1	$ 1	$ 3	$ 3
Recognized prior service credit	(8)	(9)	(25)	(28)
Recognized net loss	0	1	2	3
Net periodic cost (benefit)	(7)	(7)	(20)	(22)
U.S. | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	5	10	14
Interest cost	13	12	39	35
Expected return on plan assets	(17)	(22)	(52)	(63)
Recognized prior service credit	1	0	1	0
Recognized net loss	14	16	42	40
Net periodic cost (benefit)	13	11	40	26
Pension Benefits - Non-U.S. Plans | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	5	10	19
Interest cost	15	19	54	58
Expected return on plan assets	(31)	(40)	(100)	(120)
Pension settlements and curtailments	0	0	(14)	0
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement	6	0	37
Recognized prior service credit	0	(2)	(1)	(8)
Recognized net loss	7	11	26	33
Net periodic cost (benefit)	$ (1)	$ (7)	$ 12	$ (18)