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Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | ---
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |  |  |  |
Amortized Cost | $ 109,647 |  | $ 105,177 |  |  |
Gross unrealized gains | 2,282 |  | 14,039 |  |  |
Gross unrealized losses | 8,552 |  | 451 |  |  |
Allowance for Credit Losses | 12 | $ 20 | 19 | $ 9 | $ 14 | $ 13
Fair Value | 103,365 |  | 118,746 |  |  |
Corporate Bonds [Member] |  |  |  |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |  |  |  |
Amortized Cost | 88,791 |  | 86,373 |  |  |
Gross unrealized gains | 1,648 |  | 12,113 |  |  |
Gross unrealized losses | 7,274 |  | 349 |  |  |
Allowance for Credit Losses | 7 | 16 | 17 | 8 | 13 | 12
Fair Value | 83,158 |  | 98,120 |  |  |
U.S. Government Bonds [Member] |  |  |  |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |  |  |  |
Amortized Cost | 415 |  | 375 |  |  |
Gross unrealized gains | 14 |  | 60 |  |  |
Gross unrealized losses | 14 |  | 2 |  |  |
Fair Value | 415 |  | 433 |  |  |
State And Municipal Bonds [Member] |  |  |  |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |  |  |  |
Amortized Cost | 5,422 |  | 5,322 |  |  |
Gross unrealized gains | 421 |  | 1,311 |  |  |
Gross unrealized losses | 320 |  | 12 |  |  |
Fair Value | 5,523 |  | 6,621 |  |  |
Foreign Government Bonds [Member] |  |  |  |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |  |  |  |
Amortized Cost | 361 |  | 373 |  |  |
Gross unrealized gains | 26 |  | 64 |  |  |
Gross unrealized losses | 39 |  | 5 |  |  |
Fair Value | 348 |  | 432 |  |  |
RMBS [Member] |  |  |  |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |  |  |  |
Amortized Cost | 2,241 |  | 2,334 |  |  |
Gross unrealized gains | 51 |  | 196 |  |  |
Gross unrealized losses | 107 |  | 4 |  |  |
Allowance for Credit Losses | 3 | $ 2 | 1 | $ 1 | $ 1 | $ 1
Fair Value | 2,182 |  | 2,525 |  |  |
CMBS [Member] |  |  |  |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |  |  |  |
Amortized Cost | 1,708 |  | 1,552 |  |  |
Gross unrealized gains | 2 |  | 61 |  |  |
Gross unrealized losses | 153 |  | 14 |  |  |
Fair Value | 1,557 |  | 1,599 |  |  |
ABS [Member] |  |  |  |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |  |  |  |
Amortized Cost | 10,274 |  | 8,439 |  |  |
Gross unrealized gains | 47 |  | 127 |  |  |
Gross unrealized losses | 610 |  | 54 |  |  |
Allowance for Credit Losses | 1 |  |  |  |  |
Fair Value | 9,710 |  | 8,512 |  |  |
Hybrid And Redeemable Preferred Securities [Member] |  |  |  |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |  |  |  |
Amortized Cost | 435 |  | 409 |  |  |
Gross unrealized gains | 73 |  | 107 |  |  |
Gross unrealized losses | 35 |  | 11 |  |  |
Allowance for Credit Losses | 1 |  | 1 |  |  |
Fair Value | $ 472 |  | $ 504 |  |  |

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