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Investments (Narrative) (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 USD ($) securities | Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) securities
Investment Narrative [Line Items] |  |  |
Securities As Percentage Of Consolidated Stockholder Equity | 10.00% |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 100.00% |  | 100.00%
Funds withheld at interest | $ 5,642 |  | $ 5,683
Funds Held Under Reinsurance Agreements Asset Specific Client | $ 3,300 |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | securities | 6,101,000 |  | 5,788
Financing Receivable, before Allowance for Credit Loss | $ 7,633 |  | $ 7,459
Real Estate Owned, Transfer to Real Estate Owned | 21 | $ 17 |
Financial Asset, Equal to or Greater than 90 Days Past Due |  |  |
Investment Narrative [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 23 | $ 19 |
CALIFORNIA |  |  |
Investment Narrative [Line Items] |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 14.00% |  |
TEXAS |  |  |
Investment Narrative [Line Items] |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 10.40% |  |
CANADA |  |  |
Investment Narrative [Line Items] |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 4.00% |  |
UNITED KINGDOM |  |  |
Investment Narrative [Line Items] |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 2.40% |  |
WASHINGTON |  |  |
Investment Narrative [Line Items] |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 7.30% |  |

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