Pension, Savings and Other Postretirement Benefit Plans - Defined Benefit Pension Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
U.S.
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Type [Extensible List]	us-gaap:PensionPlansDefinedBenefitMember	us-gaap:PensionPlansDefinedBenefitMember	us-gaap:PensionPlansDefinedBenefitMember	us-gaap:PensionPlansDefinedBenefitMember
Service cost	$ 1	$ 1	$ 2	$ 2
Interest cost	32	42	65	86
Expected return on plan assets	(48)	(55)	(97)	(111)
Amortization of net losses	28	28	55	56
Net periodic pension cost	13	16	25	33
Net curtailments/settlements/termination benefits	6		7
Total defined benefit pension cost	$ 19	$ 16	$ 32	$ 33
Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Type [Extensible List]	us-gaap:PensionPlansDefinedBenefitMember	us-gaap:PensionPlansDefinedBenefitMember	us-gaap:PensionPlansDefinedBenefitMember	us-gaap:PensionPlansDefinedBenefitMember
Service cost	$ 7	$ 7	$ 14	$ 14
Interest cost	14	17	28	35
Expected return on plan assets	(13)	(15)	(27)	(30)
Amortization of prior service cost		1	1	1
Amortization of net losses	9	7	19	14
Net periodic pension cost	17	17	35	34
Net curtailments/settlements/termination benefits		(1)	1
Total defined benefit pension cost	$ 17	$ 16	$ 36	$ 34