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Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) - Fixed Maturity AFS Securities [Member] - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | $ 91,190 | $ 92,429
Gross unrealized gains |  | 8,887 | 3,981
Gross unrealized losses |  | 391 | 2,430
OTTI | [1] | (47) | (44)
Fair value |  | 99,733 | 94,024
Corporate Bonds [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 77,806 | 79,623
Gross unrealized gains |  | 7,327 | 2,980
Gross unrealized losses |  | 340 | 2,263
OTTI | [1] | 3 | (8)
Fair value |  | 84,790 | 80,348
ABS [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 1,042 | 916
Gross unrealized gains |  | 59 | 42
Gross unrealized losses |  | 4 | 6
OTTI | [1] | (20) | (14)
Fair value |  | 1,117 | 966
U.S. Government Bonds [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 381 | 390
Gross unrealized gains |  | 49 | 29
Gross unrealized losses |  |  | 2
Fair value |  | 430 | 417
Foreign Government Bonds [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 380 | 406
Gross unrealized gains |  | 60 | 42
Fair value |  | 440 | 448
RMBS [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 3,089 | 3,308
Gross unrealized gains |  | 193 | 118
Gross unrealized losses |  | 11 | 67
OTTI | [1] | (21) | (14)
Fair value |  | 3,292 | 3,373
CMBS [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 920 | 811
Gross unrealized gains |  | 41 | 6
Gross unrealized losses |  |  | 16
OTTI | [1] | (4) | (3)
Fair value |  | 965 | 804
CLOs [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 2,418 | 1,746
Gross unrealized gains |  | 9 | 3
Gross unrealized losses |  | 7 | 24
OTTI | [1] | (5) | (5)
Fair value |  | 2,425 | 1,730
State And Municipal Bonds [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 4,594 | 4,647
Gross unrealized gains |  | 1,079 | 716
Gross unrealized losses |  | 4 | 18
Fair value |  | 5,669 | 5,345
Hybrid And Redeemable Preferred Securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 560 | 582
Gross unrealized gains |  | 70 | 45
Gross unrealized losses |  | 25 | 34
Fair value |  | $ 605 | $ 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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