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Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | $ 92,894 | $ 92,429
Gross unrealized gains |  | 6,055 | 3,981
Gross unrealized losses |  | 933 | 2,430
OTTI | [1] | (34) | (44)
Fair value |  | 98,050 | 94,024
Fixed Maturity AFS Securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 92,894 |
Fair value |  | 98,050 |
Fixed Maturity AFS Securities [Member] | Corporate Bonds [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 79,243 | 79,623
Gross unrealized gains |  | 4,813 | 2,980
Gross unrealized losses |  | 838 | 2,263
OTTI | [1] | 10 | (8)
Fair value |  | 83,208 | 80,348
Fixed Maturity AFS Securities [Member] | ABS [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 990 | 916
Gross unrealized gains |  | 46 | 42
Gross unrealized losses |  | 6 | 6
OTTI | [1] | (17) | (14)
Fair value |  | 1,047 | 966
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 |  | 387 | 390
Gross unrealized gains |  | 37 | 29
Gross unrealized losses |  | 1 | 2
Fair value |  | 423 | 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 |  | 403 | 406
Gross unrealized gains |  | 50 | 42
Fair value |  | 453 | 448
Fixed Maturity AFS Securities [Member] | RMBS [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 3,296 | 3,308
Gross unrealized gains |  | 142 | 118
Gross unrealized losses |  | 42 | 67
OTTI | [1] | (18) | (14)
Fair value |  | 3,414 | 3,373
Fixed Maturity AFS Securities [Member] | CMBS [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 868 | 811
Gross unrealized gains |  | 16 | 6
Gross unrealized losses |  | 3 | 16
OTTI | [1] | (4) | (3)
Fair value |  | 885 | 804
Fixed Maturity AFS Securities [Member] | CLOs [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 2,439 | 1,746
Gross unrealized gains |  | 4 | 3
Gross unrealized losses |  | 11 | 24
OTTI | [1] | (5) | (5)
Fair value |  | 2,437 | 1,730
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 |  | 4,687 | 4,647
Gross unrealized gains |  | 890 | 716
Gross unrealized losses |  | 8 | 18
Fair value |  | 5,569 | 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 |  | 581 | 582
Gross unrealized gains |  | 57 | 45
Gross unrealized losses |  | 24 | 34
Fair value |  | $ 614 | $ 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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