Pension and Other Postretirement Benefits - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected employer contribution next fiscal year	$ 10
Defined contribution plan, employer contribution amount	28	$ 22	$ 22
Retirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 182	$ 179