Income Tax Expense (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized Tax Benefits	$ 3	$ 11	$ 11
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	8
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions	$ (8)	$ 0