Retirement Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Allocated Service Cost	$ 28	$ 41	$ 54
Defined Contribution Plan, Cost	11	10	9
Other Postretirement Benefits Cost (Reversal of Cost)	$ 1	$ 2	$ 3