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Investments (Amortized Cost and Fair Value of Fixed Maturity Holdings by Industry Type) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Corporate Secturities by Investment Sector And Credit Rating [Line Items] |  |
Available for Sale at Fair value - Amortized cost | $ 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
Corporate Debt Securities [Member] |  |
Corporate Secturities by Investment Sector And Credit Rating [Line Items] |  |
Available for Sale at Fair value - Amortized cost | 35,239 | 31,963
Available-for-sale at fair value (amortized cost of $55,873 and $49,548; allowance for credit losses of $31 and $20) | $ 38,103 | $ 36,208
Percentage Of Total Available For Sales Securities | 100.00% | 100.00%
Financial Services Sector [Member] | Corporate Debt Securities [Member] |  |
Corporate Secturities by Investment Sector And Credit Rating [Line Items] |  |
Available for Sale at Fair value - Amortized cost | $ 13,101 | $ 11,785
Available-for-sale at fair value (amortized cost of $55,873 and $49,548; allowance for credit losses of $31 and $20) | $ 14,045 | $ 13,236
Percentage Of Total Available For Sales Securities | 36.90% | 36.60%
Commercial and Industrial Sector [Member] | Corporate Debt Securities [Member] |  |
Corporate Secturities by Investment Sector And Credit Rating [Line Items] |  |
Available for Sale at Fair value - Amortized cost | $ 17,857 | $ 16,274
Available-for-sale at fair value (amortized cost of $55,873 and $49,548; allowance for credit losses of $31 and $20) | $ 19,375 | $ 18,435
Percentage Of Total Available For Sales Securities | 50.80% | 50.90%
Utility Industry [Member] | Corporate Debt Securities [Member] |  |
Corporate Secturities by Investment Sector And Credit Rating [Line Items] |  |
Available for Sale at Fair value - Amortized cost | $ 4,281 | $ 3,904
Available-for-sale at fair value (amortized cost of $55,873 and $49,548; allowance for credit losses of $31 and $20) | $ 4,683 | $ 4,537
Percentage Of Total Available For Sales Securities | 12.30% | 12.50%

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