Pensions and Other Postretirement Benefits - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined contribution plan, total cost recognized	$ 26	$ 28	$ 31
Defined contribution plan and other non-qualified supplemental retirement plan, total expense recognized	2	2	$ 2
Postretirement Plans Other Than Pensions
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Funded status of plan, asset (liability)	(40)	$ (45)
Defined Benefit Plan, Expected Future Benefit Payment, Year One	$ 4
Health care cost trend rate assumed for current fiscal year, participants under 65	6.30%
Health care cost trend rate assumed for current fiscal year, participants over 65	6.50%
Ultimate health care cost trend rate in 2032	4.50%