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Investments (Narrative) (Details) $ in Millions | Mar. 31, 2022 USD ($) securities | Dec. 31, 2021 USD ($) securities
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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 | $ 6,737 | $ 6,954
Funds Held Under Reinsurance Agreements Asset Specific Client | 4,400 |
Financing Receivable, Troubled Debt Restructuring | $ 77 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | securities | 4,136,000 | 1,862
CALIFORNIA |  |
Investment Narrative [Line Items] |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 12.70% |
TEXAS |  |
Investment Narrative [Line Items] |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 12.40% |
GEORGIA |  |
Investment Narrative [Line Items] |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 7.50% |
CANADA |  |
Investment Narrative [Line Items] |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 3.20% |
UNITED KINGDOM |  |
Investment Narrative [Line Items] |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 2.50% |

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- Definition The amount represents the total percentage of each property type in comparison to the total of mortgage loans whose balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. + References No definition available. + Details
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