Benefit Plans and Other Postretirement Benefits Defined Contribution Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Retirement Benefits [Abstract]
Defined Contribution Plan, Cost	$ 50	$ 49	$ 46
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Contribution Plan, Cost	50	49	$ 46
Estimated costs of health plan subsidies - VRP	29	34
Estimated cost of other medical benefits - VRP	$ 4	$ 5