Pension and Other Postretirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 1	$ 1	$ 2	$ 2
Recognized prior service credit	(8)	(10)	(17)	(19)
Recognized net loss	1	1	2	2
Net periodic cost (benefit)	(6)	(8)	(13)	(15)
Pension Benefits - U.S. Plans | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	5	8	9
Interest cost	13	11	26	23
Expected return on plan assets	(17)	(21)	(35)	(42)
Recognized net loss	14	12	28	24
Net periodic cost (benefit)	13	7	27	14
Pension Benefits - Non-U.S. Plans | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	4	7	8	14
Interest cost	20	20	39	39
Expected return on plan assets	(34)	(40)	(69)	(80)
Pension settlements and curtailments	0	0	(14)	0
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement	31		31
Recognized prior service credit	(1)	(3)	(1)	(6)
Recognized net loss	9	11	19	22
Net periodic cost (benefit)	$ 29	$ (5)	$ 13	$ (11)