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Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
Income Taxes (Narrative) (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Contingency [Line Items]
Accrual withholding taxes, percent	5.00%
Income tax rate	21.00%	21.00%	21.00%	21.00%	21.00%	35.00%
Income tax expense (benefit)	$ (9,000,000)	$ 167,000,000	$ 71,000,000
Increase (decrease) in unrecognized tax benefits attributable to uncertain tax positions	0	0	0
Deferred tax assets, valuation allowance	25,000,000	18,000,000
Foreign tax credits	3,000,000	22,000,000
Tax benefits related to restricted stock vestings and stock options exercises	2,000,000	2,000,000	3,000,000
Tax benefits related to payment of dividends on restricted stock	600,000	600,000	600,000
Unrealized losses on available for sale fixed maturity securities	218,000,000
CARES Act [Member]
Income Tax Contingency [Line Items]
Income tax expense (benefit)	33,000,000
Net refund	183,000,000
Branch Basket [Member]
Income Tax Contingency [Line Items]
Foreign tax credits	$ 3,000,000	29,000,000
Tax credit carryforward expiration	Dec. 31, 2030
Her Majestys Revenue And Customs H M R C [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards	$ 16,000,000
Swiss Federal Tax Administration F T A [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards	$ 5,000,000
Tax credit carryforward expiration	Dec. 31, 2028
Revenue Commissioners Ireland [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards	$ 4,000,000
Internal Revenue Service I R S [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards	3,000,000
Foreign Country [Member]
Income Tax Contingency [Line Items]
Income tax expense (benefit)	5,000,000	$ 5,000,000
Increase (decrease) in valuation allowance	(7,000,000)
Tax Year 2015 [Member]
Income Tax Contingency [Line Items]
Net refund	(2,000,000)
Tax Year 2016 [Member]
Income Tax Contingency [Line Items]
Net refund	$ (5,000,000)