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Income Taxes (Narrative) (Details) - USD ($) | 12 Months Ended
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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) |  |  |  |  |

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