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Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |  |  |  |
Amortized Cost | $ 111,354 |  | $ 111,707 |  |  |
Gross unrealized gains | 1,201 |  | 1,069 |  |  |
Gross unrealized losses | 11,640 |  | 13,018 |  |  |
Allowance for Credit Losses | 25 | $ 39 | 22 | $ 12 | $ 20 | $ 19
Fair Value | 100,890 |  | 99,736 |  |  |
Corporate Bonds [Member] |  |  |  |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |  |  |  |
Amortized Cost | 88,334 |  | 89,249 |  |  |
Gross unrealized gains | 874 |  | 787 |  |  |
Gross unrealized losses | 9,888 |  | 11,004 |  |  |
Allowance for Credit Losses | 13 | 27 | 9 | 7 | 16 | 17
Fair Value | 79,307 |  | 79,023 |  |  |
U.S. Government Bonds [Member] |  |  |  |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |  |  |  |
Amortized Cost | 396 |  | 405 |  |  |
Gross unrealized gains | 5 |  | 5 |  |  |
Gross unrealized losses | 30 |  | 31 |  |  |
Fair Value | 371 |  | 379 |  |  |
State And Municipal Bonds [Member] |  |  |  |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |  |  |  |
Amortized Cost | 5,268 |  | 5,410 |  |  |
Gross unrealized gains | 218 |  | 172 |  |  |
Gross unrealized losses | 412 |  | 512 |  |  |
Fair Value | 5,074 |  | 5,070 |  |  |
Foreign Government Bonds [Member] |  |  |  |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |  |  |  |
Amortized Cost | 312 |  | 348 |  |  |
Gross unrealized gains | 15 |  | 17 |  |  |
Gross unrealized losses | 46 |  | 47 |  |  |
Fair Value | 281 |  | 318 |  |  |
RMBS [Member] |  |  |  |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |  |  |  |
Amortized Cost | 2,205 |  | 2,216 |  |  |
Gross unrealized gains | 22 |  | 22 |  |  |
Gross unrealized losses | 206 |  | 222 |  |  |
Allowance for Credit Losses | 6 | $ 6 | 7 | $ 3 | $ 2 | $ 1
Fair Value | 2,015 |  | 2,009 |  |  |
CMBS [Member] |  |  |  |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |  |  |  |
Amortized Cost | 1,915 |  | 1,917 |  |  |
Gross unrealized gains | 1 |  | 3 |  |  |
Gross unrealized losses | 232 |  | 246 |  |  |
Fair Value | 1,684 |  | 1,674 |  |  |
ABS [Member] |  |  |  |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |  |  |  |
Amortized Cost | 12,562 |  | 11,797 |  |  |
Gross unrealized gains | 40 |  | 38 |  |  |
Gross unrealized losses | 804 |  | 926 |  |  |
Allowance for Credit Losses | 5 |  | 5 |  |  |
Fair Value | 11,793 |  | 10,904 |  |  |
Hybrid And Redeemable Preferred Securities [Member] |  |  |  |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |  |  |  |
Amortized Cost | 362 |  | 365 |  |  |
Gross unrealized gains | 26 |  | 25 |  |  |
Gross unrealized losses | 22 |  | 30 |  |  |
Allowance for Credit Losses | 1 |  | 1 |  |  |
Fair Value | $ 365 |  | $ 359 |  |  |

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