Pensions and Other Postretirement Benefits - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined contribution plan, total cost recognized	$ 19	$ 21	$ 26
Defined contribution plan and other non-qualified supplemental retirement plan, total expense recognized	0	0	$ 0
Postretirement Plans Other Than Pensions
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Funded status of plan, asset (liability)	(23)	$ (31)
Postretirement liability	$ (3)
Health care cost trend rate assumed for current fiscal year, participants under 65	7.70%
Health care cost trend rate assumed for current fiscal year, participants over 65	9.00%
Ultimate health care cost trend rate in 2032	4.50%