Pension, Savings and Other Postretirement Benefit Plans - Defined Benefit Pension Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
U.S.
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Type [Extensible List]	us-gaap:PensionPlansDefinedBenefitMember	us-gaap:PensionPlansDefinedBenefitMember
Service cost	$ 1	$ 1
Interest cost	33	44
Expected return on plan assets	(49)	(56)
Amortization of net losses	27	28
Net periodic pension cost	12	17
Net curtailments/settlements/termination benefits	1	0
Total defined benefit pension cost	$ 13	$ 17
Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Type [Extensible List]	us-gaap:PensionPlansDefinedBenefitMember	us-gaap:PensionPlansDefinedBenefitMember
Service cost	$ 7	$ 7
Interest cost	14	18
Expected return on plan assets	(14)	(15)
Amortization of prior service cost	1	0
Amortization of net losses	10	7
Net periodic pension cost	18	17
Net curtailments/settlements/termination benefits	1	1
Total defined benefit pension cost	$ 19	$ 18