Pension and Other Postretirement Benefit Plans - Summary of Components of Net Periodic Pension Costs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 2
Interest cost	1	3
Expected return on plan assets	0	0
Amortization:
Actuarial loss	0	0
Prior service credit	(11)	(2)
Settlement and curtailment (gain) loss	0	0
Net periodic benefit cost (credit)	(10)	3
United States Pension Benefits | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1
Interest cost	19	25
Expected return on plan assets	(39)	(41)
Amortization:
Actuarial loss	17	15
Prior service credit	0	0
Settlement and curtailment (gain) loss	0	0
Net periodic benefit cost (credit)	(2)	0
Foreign Pension Benefits | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	2
Interest cost	4	4
Expected return on plan assets	(9)	(8)
Amortization:
Actuarial loss	5	3
Prior service credit	0	0
Settlement and curtailment (gain) loss	0	0
Net periodic benefit cost (credit)	$ 1	$ 1