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Investments (Narrative) (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Investment Narrative [Line Items] |  |  |  |  |  |  |  |  |
Funds Held Under Reinsurance Agreements Asset Specific Client | $ 4,700 |  |  | $ 4,700 |  |  |  |  |
Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments | $ 30 |  | $ 46 | $ 43 | $ 54 |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 1,223 |  |  | 1,223 |  | 877 |  |  |
Securities As Percentage Of Consolidated Stockholder Equity | 10.00% |  |  | 10.00% |  |  |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 100.00% |  |  | 100.00% |  | 100.00% |  |  |
Funds withheld at interest | $ 7,049 |  |  | $ 7,049 |  | $ 5,432 |  |  |
Pre Tax Gains In Investment Related Gains Associated With Investments In Limited Partnerships |  |  |  | 70 |  |  |  |  |
Reclassification of Pre Tax Unrealized Gains From AOCI to Investment Income Associated With Limited Partnerships |  | $ 92 |  |  |  |  |  |  |
Mortgage Loan Carrying Value Payout Adjusted Due To COVID-19 | 10 |  |  | 10 |  | 660 |  |  |
Accounts Receivable, Allowance for Credit Loss | 1 |  |  | 1 |  | 2 |  |  |
Revision of Prior Period, Reclassification, Adjustment |  |  |  |  |  |  |  |  |
Investment Narrative [Line Items] |  |  |  |  |  |  |  |  |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest |  |  |  |  |  | 102 | $ (2) | $ 1 | $ 10
Fixed maturity securities |  |  |  |  |  |  |  |  |
Investment Narrative [Line Items] |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 16 |  |  | 16 |  | 20 |  |  |
Fixed maturity securities | Corporate Debt Securities [Member] |  |  |  |  |  |  |  |  |
Investment Narrative [Line Items] |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | $ 11 |  |  | $ 11 |  | $ 17 |  |  |
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 | 13.50% |  |  | 13.50% |  |  |  |  |
CANADA |  |  |  |  |  |  |  |  |
Investment Narrative [Line Items] |  |  |  |  |  |  |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 3.20% |  |  | 3.20% |  |  |  |  |
UNITED KINGDOM |  |  |  |  |  |  |  |  |
Investment Narrative [Line Items] |  |  |  |  |  |  |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 1.80% |  |  | 1.80% |  |  |  |  |
GEORGIA |  |  |  |  |  |  |  |  |
Investment Narrative [Line Items] |  |  |  |  |  |  |  |  |
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 8.10% |  |  | 8.10% |  |  |  |  |

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