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Investments (Amortized Cost and Fair Value of Fixed Maturities by Contractual Maturities) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract] |  |
Available-for-sale Securities, Debt Maturities, within One Year, Amortized Cost Basis | $ 1,641 |
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Amortized Cost Basis | 9,698 |
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Amortized Cost Basis | 10,969 |
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost | 26,731 |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost | 6,834 |
Available for Sale at Fair value - Amortized cost | 55,873 | $ 49,548
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value | 1,649 |
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value | 10,115 |
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value | 11,700 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value | 30,381 |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value | 6,904 |
Fixed maturity securities available-for-sale | $ 60,749 | $ 56,735

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