Pension and Other Postretirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0
Interest cost	1	1
Recognized prior service credit	(9)	(9)
Recognized net loss	1	1
Net periodic cost (benefit)	(7)	(7)
Pension Benefits - U.S. Plans | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	4
Interest cost	13	12
Expected return on plan assets	(18)	(21)
Recognized net loss	14	12
Net periodic cost (benefit)	14	7
Pension Benefits - Non-U.S. Plans | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	4	7
Interest cost	19	19
Expected return on plan assets	(35)	(40)
Pension settlements and curtailments	(14)	0
Recognized prior service credit	0	(3)
Recognized net loss	10	11
Net periodic cost (benefit)	$ (16)	$ (6)