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Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | $ 94,295 | $ 92,429
Gross unrealized gains |  | 11,086 | 3,981
Gross unrealized losses |  | 240 | 2,430
OTTI | [1] | (59) | (44)
Fair value |  | 105,200 | 94,024
Fixed Maturity AFS Securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 94,295 |
Fair value |  | 105,200 |
Fixed Maturity AFS Securities [Member] | Corporate Bonds [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 79,417 | 79,623
Gross unrealized gains |  | 9,479 | 2,980
Gross unrealized losses |  | 184 | 2,263
OTTI | [1] | (4) | (8)
Fair value |  | 88,716 | 80,348
Fixed Maturity AFS Securities [Member] | ABS [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 4,810 | 2,662
Gross unrealized gains |  | 62 | 45
Gross unrealized losses |  | 18 | 30
OTTI | [1] | (35) | (19)
Fair value |  | 4,889 | 2,696
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 |  | 384 | 390
Gross unrealized gains |  | 51 | 29
Gross unrealized losses |  |  | 2
Fair value |  | 435 | 417
Fixed Maturity AFS Securities [Member] | Foreign Government Bonds [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 329 | 406
Gross unrealized gains |  | 64 | 42
Fair value |  | 393 | 448
Fixed Maturity AFS Securities [Member] | RMBS [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 3,042 | 3,308
Gross unrealized gains |  | 190 | 118
Gross unrealized losses |  | 10 | 67
OTTI | [1] | (19) | (14)
Fair value |  | 3,241 | 3,373
Fixed Maturity AFS Securities [Member] | CMBS [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 1,038 | 811
Gross unrealized gains |  | 45 | 6
Gross unrealized losses |  | 1 | 16
OTTI | [1] | (1) | (3)
Fair value |  | 1,083 | 804
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 |  | 4,778 | 4,647
Gross unrealized gains |  | 1,113 | 716
Gross unrealized losses |  | 7 | 18
Fair value |  | 5,884 | 5,345
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 |  | 497 | 582
Gross unrealized gains |  | 82 | 45
Gross unrealized losses |  | 20 | 34
Fair value |  | $ 559 | $ 593
[1] | Includes unrealized (gains) and losses on credit-impaired securities related to changes in the fair value of such securities subsequent to the impairment measurement date.

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