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Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | $ 90,083 | $ 87,240
Gross unrealized gains |  | 4,661 | 8,233
Gross unrealized losses |  | 1,740 | 450
OTTI | [1] | (56) | (63)
Fair value |  | 93,060 | 95,086
Fixed Maturity AFS Securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 90,083 | 86,993
Gross unrealized gains |  |  | 8,217
Gross unrealized losses |  |  | 433
OTTI | [1] |  | (63)
Fair value |  | 93,060 | 94,840
Equity Securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  |  | 247
Gross unrealized gains |  |  | 16
Gross unrealized losses |  |  | 17
Fair value |  |  | 246
Corporate Bonds [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 78,009 | 75,701
Gross unrealized gains |  | 3,605 | 6,862
Gross unrealized losses |  | 1,582 | 354
OTTI | [1] | (9) | (7)
Fair value |  | 80,041 | 82,216
ABS [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 964 | 903
Gross unrealized gains |  | 44 | 51
Gross unrealized losses |  | 7 | 7
OTTI | [1] | (17) | (27)
Fair value |  | 1,018 | 974
U.S. Government Bonds [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 396 | 527
Gross unrealized gains |  | 29 | 41
Gross unrealized losses |  | 3 | 1
Fair value |  | 422 | 567
Foreign Government Bonds [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 430 | 395
Gross unrealized gains |  | 41 | 56
Fair value |  | 471 | 451
RMBS [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 3,317 | 3,327
Gross unrealized gains |  | 119 | 155
Gross unrealized losses |  | 84 | 39
OTTI | [1] | (22) | (22)
Fair value |  | 3,374 | 3,465
CMBS [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 759 | 590
Gross unrealized gains |  | 5 | 10
Gross unrealized losses |  | 20 | 2
OTTI | [1] | (3) | (2)
Fair value |  | 747 | 600
CLOs [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 1,121 | 803
Gross unrealized gains |  |  | 2
Gross unrealized losses |  | 7 | 2
OTTI | [1] | (5) | (5)
Fair value |  | 1,119 | 808
State And Municipal Bonds [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 4,509 | 4,172
Gross unrealized gains |  | 753 | 953
Gross unrealized losses |  | 14 | 6
Fair value |  | 5,248 | 5,119
Hybrid And Redeemable Preferred Securities [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 578 | 575
Gross unrealized gains |  | 65 | 87
Gross unrealized losses |  | 23 | 22
Fair value |  | $ 620 | $ 640
[1] | Includes unrealized (gains) and losses on impaired securities related to changes in the fair value of such securities subsequent to the impairment measurement date.

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