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Investments (Narrative) (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 USD ($) securities | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) securities
Investment Narrative [Line Items] |  |  |
Accounts Receivable, Allowance for Credit Loss | $ 1 |  | $ 2
Document Period End Date | Mar. 31, 2021 |  |
Sales of fixed maturity securities available-for-sale | $ 2,738 | $ 2,141 |
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash | 5 |  |
Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments | 13 | 8 |
Available-for-sale Securities, Gross Realized Gains | $ 167 | 27 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | securities | 1,650,000 |  | 877
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 | $ 5,459 |  | $ 5,432
Funds Held Under Reinsurance Agreements Asset Specific Client | 3,200 |  |
Gain (Loss) on Sale of Equity Investments | 3 | $ (23) |
Mortgage Loan Carrying Value Payout Adjusted Due To COVID-19 | $ 10 |  | $ 660
CALIFORNIA |  |  |
Investment Narrative [Line Items] |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 13.90% |  |
TEXAS |  |  |
Investment Narrative [Line Items] |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 13.60% |  |
GEORGIA |  |  |
Investment Narrative [Line Items] |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 8.80% |  |
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 | 1.80% |  |

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