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Investments (Available-For-Sale Securities By Contractual Maturities) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Available-for-sale Securities, Debt Maturities, Amortized Cost |  |
Amortized Cost | $ 111,707 | $ 105,142
Available-for-sale Securities, Debt Maturities, Fair Value |  |
Fair Value | 99,736 | 118,711
Fixed maturity securities [Member] |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost |  |
Amortized Cost | 111,707 | 105,142
Available-for-sale Securities, Debt Maturities, Fair Value |  |
Fair Value | 99,736 | $ 118,711
Fixed maturity securities [Member] | Fixed maturity AFS securities other than structured securities [Member] |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost |  |
Due in one year or less | 3,386 |
Due after one year through five years | 17,659 |
Due after five years through ten years | 18,568 |
Due after ten years | 56,164 |
Amortized Cost | 95,777 |
Available-for-sale Securities, Debt Maturities, Fair Value |  |
Due in one year or less | 3,352 |
Due after one year through five years | 16,816 |
Due after five years through ten years | 16,736 |
Due after ten years | 48,245 |
Fair Value | 85,149 |
Fixed maturity securities [Member] | Structured securities [Member] |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost |  |
Amortized Cost | 15,930 |
Available-for-sale Securities, Debt Maturities, Fair Value |  |
Fair Value | $ 14,587 |

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