Income Tax (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Loss Carryforwards [Line Items]
Proceeds from Income Tax Refunds	$ 12	$ 13	$ 3
Cash paid for income taxes	90	311	131
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	220
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	3	3
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		303
Unrecognized Tax Benefits	33	33	36	$ 34
Decrease in Unrecognized Tax Benefits is Reasonably Possible	6
Cash paid for income taxes	90	311	131
Deferred Tax Assets, Valuation Allowance	678	567
Proceeds from Income Tax Refunds	12	13	3
Operating Loss Carryforwards	3,899
Unrecognized Tax Benefits	33	33	$ 36	$ 34
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	3	$ 3
Foreign Tax Jurisdiction | Revenue Commissioners, Ireland
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	$ 23