Pension, Savings and Other Postretirement Benefit Plans - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Postretirement benefits expense (credit)	$ 2	$ (3)
Defined contribution plans, contribution expenses	28	30
U.S.
Defined Benefit Plan Disclosure [Line Items]
Net periodic cost	7	13
Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Net periodic cost	16	19
Contributions to pension plans	2
Minimum | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to funded pension plans in current year	25
Maximum | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to funded pension plans in current year	$ 50
Pension Plan | Other (Income) Expense
Defined Benefit Plan Disclosure [Line Items]
Pension settlement charges		2
Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Curtailment credit (charge)		$ 4