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Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020
--- | --- | --- | --- | --- | ---
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |  |  |
Amortized Cost | $ 107,459 |  | $ 104,174 |  |
Allowance for Credit Losses | 17 |  | 13 |  |
Fair Value | 122,085 |  | 123,044 |  |
Fixed Maturity AFS Securities [Member] |  |  |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |  |  |
Amortized Cost | 107,459 |  | 104,174 |  |
Gross unrealized gains | 15,043 |  | 19,081 |  |
Gross unrealized losses | 400 |  | 198 |  |
Allowance for Credit Losses | 17 | $ 9 | 13 | $ 12 | $ 22
Fair Value | 122,085 |  | 123,044 |  |
Fixed Maturity AFS Securities [Member] | Corporate Bonds [Member] |  |  |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |  |  |
Amortized Cost | 88,238 |  | 86,289 |  |
Gross unrealized gains | 12,964 |  | 16,662 |  |
Gross unrealized losses | 324 |  | 150 |  |
Allowance for Credit Losses | 16 | 8 | 12 | 11 | 20
Fair Value | 100,862 |  | 102,789 |  |
Fixed Maturity AFS Securities [Member] | U.S. Government Bonds [Member] |  |  |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |  |  |
Amortized Cost | 385 |  | 397 |  |
Gross unrealized gains | 60 |  | 88 |  |
Gross unrealized losses | 2 |  | 1 |  |
Fair Value | 443 |  | 484 |  |
Fixed Maturity AFS Securities [Member] | State And Municipal Bonds [Member] |  |  |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |  |  |
Amortized Cost | 5,543 |  | 5,360 |  |
Gross unrealized gains | 1,369 |  | 1,561 |  |
Gross unrealized losses | 11 |  |  |  |
Fair Value | 6,901 |  | 6,921 |  |
Fixed Maturity AFS Securities [Member] | Foreign Government Bonds [Member] |  |  |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |  |  |
Amortized Cost | 455 |  | 384 |  |
Gross unrealized gains | 64 |  | 87 |  |
Gross unrealized losses | 7 |  | 1 |  |
Fair Value | 512 |  | 470 |  |
Fixed Maturity AFS Securities [Member] | RMBS [Member] |  |  |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |  |  |
Amortized Cost | 2,687 |  | 2,765 |  |
Gross unrealized gains | 252 |  | 313 |  |
Gross unrealized losses | 3 |  | 1 |  |
Allowance for Credit Losses | 1 | $ 1 | 1 | $ 1 | 1
Fair Value | 2,935 |  | 3,076 |  |
Fixed Maturity AFS Securities [Member] | CMBS [Member] |  |  |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |  |  |
Amortized Cost | 1,528 |  | 1,390 |  |
Gross unrealized gains | 76 |  | 115 |  |
Gross unrealized losses | 10 |  |  |  |
Fair Value | 1,594 |  | 1,505 |  |
Fixed Maturity AFS Securities [Member] | ABS [Member] |  |  |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |  |  |
Amortized Cost | 8,186 |  | 7,041 |  |
Gross unrealized gains | 148 |  | 158 |  |
Gross unrealized losses | 31 |  | 15 |  |
Allowance for Credit Losses |  |  |  |  | $ 1
Fair Value | 8,303 |  | 7,184 |  |
Fixed Maturity AFS Securities [Member] | Hybrid And Redeemable Preferred Securities [Member] |  |  |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |  |  |
Amortized Cost | 437 |  | 548 |  |
Gross unrealized gains | 110 |  | 97 |  |
Gross unrealized losses | 12 |  | 30 |  |
Fair Value | $ 535 |  | $ 615 |  |

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