Defined Benefit Postretirement Plans and Defined Contribution Plan - Schedule of Net Periodic Benefit Cost and OCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2020
Depreciation, Depletion and Amortization [Abstract]
Net settlement loss	$ 3	$ (14)	$ (19)
Foreign Plan [Member]
Components of net periodic benefit cost:
Service cost	0	0	0
Interest cost	8	14	17
Expected return on plan assets	(11)	(24)	(30)
Depreciation, Depletion and Amortization [Abstract]
- prior service cost (credit)	0	0	0
- actuarial loss	0	0	1
Net settlement loss	0	(3)	(4)
Net periodic benefit cost	(3)	(7)	(8)
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss (pretax):
Actuarial loss (gain)	(21)	8	(26)
Amortization of actuarial (loss) gain	(41)	(3)	(4)
Prior service cost	0	3	0
Amortization of prior service credit (cost)	(6)	0	0
Total recognized in other comprehensive (income) loss	(68)	8	(30)
Total recognized in net periodic benefit cost and other comprehensive (income) loss	(71)	1	(38)
UNITED STATES
Components of net periodic benefit cost:
Service cost	19	18	22
Interest cost	12	12	13
Expected return on plan assets	(10)	(11)	(13)
Depreciation, Depletion and Amortization [Abstract]
- prior service cost (credit)	(7)	(10)	(10)
- actuarial loss	7	11	8
Net settlement loss	(12)	(18)	(28)
Net periodic benefit cost	33	38	48
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss (pretax):
Actuarial loss (gain)	14	(4)	28
Amortization of actuarial (loss) gain	(19)	(29)	(36)
Prior service cost	0	0	0
Amortization of prior service credit (cost)	7	10	10
Total recognized in other comprehensive (income) loss	2	(23)	2
Total recognized in net periodic benefit cost and other comprehensive (income) loss	35	15	50
Other Postretirement Benefit Plans, Defined Benefit [Member]
Components of net periodic benefit cost:
Service cost	1	2	2
Interest cost	3	7	8
Expected return on plan assets	0	0	0
Depreciation, Depletion and Amortization [Abstract]
- prior service cost (credit)	(19)	(8)	(7)
- actuarial loss	1	1	0
Net settlement loss	0	0	0
Net periodic benefit cost	(14)	2	3
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss (pretax):
Actuarial loss (gain)	9	(15)	5
Amortization of actuarial (loss) gain	(1)	(1)	0
Prior service cost	0	(99)	0
Amortization of prior service credit (cost)	19	8	7
Total recognized in other comprehensive (income) loss	27	(107)	12
Total recognized in net periodic benefit cost and other comprehensive (income) loss	$ 13	$ (105)	$ 15
Forecast [Member]
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]
Defined Benefit Plan, Amortization of Net Gains (Losses)				$ 9
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit)				7
Forecast [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]
Defined Benefit Plan, Amortization of Net Gains (Losses)				2
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit)				$ 18