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Investments Investments (Narrative) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) position | Dec. 31, 2019 USD ($) position | Dec. 31, 2018 USD ($)
Investment Narrative [Line Items] |  |  |  |
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash |  |  | $ 1 |
Net Amount Assets Liabilities From Repurchase Reverse Repurchase Agreements |  |  | 1 |
Available-for-sale Securities, Amortized Cost Basis |  | $ 31,963 | 29,205 |
Available-for-sale Securities |  | $ 36,208 | $ 31,393 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | position |  | 877,000 | 1,072 |
Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments |  | $ 82 | $ 50 | $ 159
Securities for Reverse Repurchase Agreements |  | $ 653 | $ 356 |
Percentage Of Total Gross Unrealized Losses |  | 100.00% | 100.00% |
Funds withheld at interest |  | $ 5,432 | $ 5,662 |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total |  | 100.00% | 100.00% |
Mortgage Loan Carrying Value Payout Adjusted Due To COVID-19 |  | $ 660 |  |
Funds Held Under Reinsurance Agreements Asset Specific Client |  | 3,200 |  |
Allowance for Credit Losses On Lifetime Mortgages |  | 2 |  |
Non-Income Producing Securities [Member] |  |  |  |
Investment Narrative [Line Items] |  |  |  |
Available-for-sale Securities, Amortized Cost Basis |  | 71 | $ 47 |
Available-for-sale Securities |  | 63 | 51 |
Canadian Province Of Quebec Securities [Member] |  |  |  |
Investment Narrative [Line Items] |  |  |  |
Available-for-sale Securities, Amortized Cost Basis |  | 1,054 | 1,014 |
Available-for-sale Securities |  | 1,528 | 1,379 |
Collateral Received Fixed Maturity Securities [Member] |  |  |  |
Investment Narrative [Line Items] |  |  |  |
Available-for-sale Securities |  | 1,784 | 727 |
Carrying Value [Member] |  |  |  |
Investment Narrative [Line Items] |  |  |  |
Securities Borrowed |  | 118 | 339 |
Funds withheld at interest | [1] | $ 5,292 | $ 5,526 |
CALIFORNIA |  |  |  |
Investment Narrative [Line Items] |  |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total |  | 14.60% |  |
TEXAS |  |  |  |
Investment Narrative [Line Items] |  |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total |  | 14.10% |  |
GEORGIA |  |  |  |
Investment Narrative [Line Items] |  |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total |  | 8.40% |  |
Canada Segment Reporting Information [Member] |  |  |  |
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 |  | 1.30% |  |
[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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