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Investments (Narrative) (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 USD ($) position | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) position | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2021 USD ($) position | Dec. 31, 2020 USD ($) position | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Investment Narrative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Funds withheld at interest |  | $ 6,954 |  |  |  | $ 5,432 |  |  |  | $ 6,954 | $ 5,432 |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total |  | 100.00% |  |  |  | 100.00% |  |  |  | 100.00% | 100.00% |  |  |
Mortgage Loan Carrying Value Payout Adjusted Due To COVID-19 |  |  |  |  |  |  |  |  |  | $ 10 | $ 660 |  |  |
Funds Held Under Reinsurance Agreements Asset Specific Client |  | $ 4,600 |  |  |  |  |  |  |  | 4,600 |  |  |  |
Available for Sale at Fair value - Amortized cost |  | 55,873 |  |  |  | $ 49,548 |  |  |  | 55,873 | 49,548 |  |  |
Available-for-sale at fair value (amortized cost of $55,873 and $49,548; allowance for credit losses of $31 and $20) |  | $ 60,749 |  |  |  | $ 56,735 |  |  |  | $ 60,749 | $ 56,735 |  |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | position |  | 1,862,000 |  |  |  | 877 |  |  |  | 1,862,000 | 877 |  |  |
Reclassification of Pre Tax Unrealized Gains From AOCI to Investment Income Associated With Limited Partnerships |  |  |  |  |  |  |  |  |  | $ 92 |  |  |  |
Pre Tax Gains In Investment Related Gains Associated With Investments In Limited Partnerships |  |  |  |  |  |  |  |  |  | 70 |  |  |  |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest |  | $ 57 | $ (34) | $ 482 | $ 186 | $ 169 | $ 285 | $ 195 | $ (96) | 691 | $ 553 | $ 1,132 |  |
Revision of Prior Period, Reclassification, Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Narrative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  | 102 | (2) | $ 1 | $ 10
Non-Income Producing Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Narrative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for Sale at Fair value - Amortized cost |  | 26 |  |  |  | 71 |  |  |  | 26 | 71 |  |  |
Available-for-sale at fair value (amortized cost of $55,873 and $49,548; allowance for credit losses of $31 and $20) |  | 26 |  |  |  | 63 |  |  |  | 26 | 63 |  |  |
Canadian Province Of Quebec Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Narrative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for Sale at Fair value - Amortized cost |  | 1,092 |  |  |  | 1,054 |  |  |  | 1,092 | 1,054 |  |  |
Available-for-sale at fair value (amortized cost of $55,873 and $49,548; allowance for credit losses of $31 and $20) |  | 1,451 |  |  |  | 1,528 |  |  |  | 1,451 | 1,528 |  |  |
Collateral Received Fixed Maturity Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Narrative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale at fair value (amortized cost of $55,873 and $49,548; allowance for credit losses of $31 and $20) |  | 1,922 |  |  |  | 1,784 |  |  |  | 1,922 | 1,784 |  |  |
Carrying Value [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Narrative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Funds withheld at interest | [1] | $ 6,747 |  |  |  | $ 5,292 |  |  |  | $ 6,747 | 5,292 |  |  |
CALIFORNIA |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Narrative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total |  | 13.40% |  |  |  |  |  |  |  | 13.40% |  |  |  |
TEXAS |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Narrative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total |  | 12.50% |  |  |  |  |  |  |  | 12.50% |  |  |  |
GEORGIA |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Narrative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total |  | 7.80% |  |  |  |  |  |  |  | 7.80% |  |  |  |
Canada Segment Reporting Information [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Narrative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total |  | 3.00% |  |  |  |  |  |  |  | 3.00% |  |  |  |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest |  |  |  |  |  |  |  |  |  | $ 143 | $ 155 | $ 183 |  |
UNITED KINGDOM |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Narrative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total |  | 2.30% |  |  |  |  |  |  |  | 2.30% |  |  |  |
[1] | Carrying values presented herein may differ from those in the Company’s consolidated balance sheets because certain items within the respective financial statement captions may be measured at fair value on a recurring basis.

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