Pension, Savings and Other Postretirement Benefit Plans - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Postretirement benefits expense	$ 1	$ 2	$ 4	$ 5
Defined contribution plans, contribution expenses	25	$ 27	75	$ 83
Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to funded pension plans in current year	25		25
Contributions to pension plans			11
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Curtailment credit (charge)			4
Other Postretirement Benefits | U.S.
Defined Benefit Plan Disclosure [Line Items]
Settlement charges	18		21
Other Postretirement Benefits | U.S. | Other (Income) Expense
Defined Benefit Plan Disclosure [Line Items]
Settlement charges			5
Other Postretirement Benefits | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Pension settlement and termination benefits	2		7
Other Postretirement Benefits | Non-U.S. | Other (Income) Expense
Defined Benefit Plan Disclosure [Line Items]
Settlement charges	$ 16		$ 19