Pension Plans, Postretirement and Other Employee Benefits - Components of Net Periodic Benefit Cost (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]
Settlement loss	$ 5		$ 5
Curtailment gain	21		21
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	$ 0	0	$ 0
Interest cost	2	3	7	10
Expected return on plan assets	0	0	0	0
Settlement loss	0	0	0	0
Curtailment gain	(21)	0	(21)	0
Net amortization:
Actuarial loss	(1)	(1)	(2)	(3)
Prior service cost (credit)	(3)	(2)	(7)	(6)
Net pension and postretirement costs (credits)	(21)	2	(19)	7
U.S. | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	1	1	2
Interest cost	11	13	31	40
Expected return on plan assets	(16)	(17)	(48)	(51)
Settlement loss	0	0	0	0
Curtailment gain	0	0	0	0
Net amortization:
Actuarial loss	(1)	(1)	(4)	(3)
Prior service cost (credit)	0	0	0	0
Net pension and postretirement costs (credits)	(4)	(2)	(12)	(6)
Non-U.S. | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	7	6	19	18
Interest cost	4	6	13	18
Expected return on plan assets	(5)	(5)	(13)	(14)
Settlement loss	5	0	5	0
Curtailment gain	0	0	0	0
Net amortization:
Actuarial loss	(3)	(1)	(7)	(4)
Prior service cost (credit)	0	1	0	1
Net pension and postretirement costs (credits)	$ 14	$ 9	$ 31	$ 27