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Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | $ 90,808 | $ 87,240
Gross unrealized gains |  | 4,237 | 8,233
Gross unrealized losses |  | 1,939 | 450
OTTI | [1] | (55) | (63)
Fair value |  | 93,161 | 95,086
Fixed Maturity AFS Securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 90,808 | 86,993
Gross unrealized gains |  |  | 8,217
Gross unrealized losses |  |  | 433
OTTI | [1] |  | (63)
Fair value |  | 93,161 | 94,840
Fixed Maturity AFS Securities [Member] | Corporate Bonds [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 78,496 | 75,701
Gross unrealized gains |  | 3,299 | 6,862
Gross unrealized losses |  | 1,724 | 354
OTTI | [1] | (9) | (7)
Fair value |  | 80,080 | 82,216
Fixed Maturity AFS Securities [Member] | ABS [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 934 | 903
Gross unrealized gains |  | 41 | 51
Gross unrealized losses |  | 7 | 7
OTTI | [1] | (17) | (27)
Fair value |  | 985 | 974
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 |  | 392 | 527
Gross unrealized gains |  | 23 | 41
Gross unrealized losses |  | 6 | 1
Fair value |  | 409 | 567
Fixed Maturity AFS Securities [Member] | Foreign Government Bonds [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 418 | 395
Gross unrealized gains |  | 41 | 56
Fair value |  | 459 | 451
Fixed Maturity AFS Securities [Member] | RMBS [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 3,267 | 3,327
Gross unrealized gains |  | 113 | 155
Gross unrealized losses |  | 114 | 39
OTTI | [1] | (21) | (22)
Fair value |  | 3,287 | 3,465
Fixed Maturity AFS Securities [Member] | CMBS [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 766 | 590
Gross unrealized gains |  | 2 | 10
Gross unrealized losses |  | 23 | 2
OTTI | [1] | (3) | (2)
Fair value |  | 748 | 600
Fixed Maturity AFS Securities [Member] | CLOs [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 1,371 | 803
Gross unrealized gains |  |  | 2
Gross unrealized losses |  | 14 | 2
OTTI | [1] | (5) | (5)
Fair value |  | 1,362 | 808
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 |  | 4,588 | 4,172
Gross unrealized gains |  | 656 | 953
Gross unrealized losses |  | 26 | 6
Fair value |  | 5,218 | 5,119
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 |  | 576 | 575
Gross unrealized gains |  | 62 | 87
Gross unrealized losses |  | 25 | 22
Fair value |  | $ 613 | 640
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
[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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