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Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | $ 86,097 | $ 84,747
Gross unrealized gains |  | 6,160 | 5,851
Gross unrealized losses |  | 915 | 1,139
Gross unrealized OTTI | [1] | (36) | (29)
Fair value |  | 91,378 | 89,488
Equity AFS securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 263 | 260
Gross unrealized gains |  | 16 | 19
Gross unrealized losses |  | 3 | 4
Fair value |  | 276 | 275
Fixed maturity AFS securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 85,834 | 84,487
Gross unrealized gains |  | 6,144 | 5,832
Gross unrealized losses |  | 912 | 1,135
Gross unrealized OTTI | [1] | (36) | (29)
Fair value |  | 91,102 | 89,213
Corporate bonds [Member] | Fixed maturity AFS securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 74,509 | 73,275
Gross unrealized gains |  | 5,036 | 4,754
Gross unrealized losses |  | 771 | 970
Gross unrealized OTTI | [1] | (5) | (5)
Fair value |  | 78,779 | 77,064
ABS [Member] | Fixed maturity AFS securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 1,017 | 1,047
Gross unrealized gains |  | 40 | 39
Gross unrealized losses |  | 12 | 14
Gross unrealized OTTI | [1] | (17) | (13)
Fair value |  | 1,062 | 1,085
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 |  | 540 | 384
Gross unrealized gains |  | 38 | 37
Gross unrealized losses |  | 2 | 2
Fair value |  | 576 | 419
Foreign government bonds [Member] | Fixed maturity AFS securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 398 | 449
Gross unrealized gains |  | 58 | 58
Gross unrealized losses |  |  | 1
Fair value |  | 456 | 506
RMBS [Member] | Fixed maturity AFS securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 3,490 | 3,534
Gross unrealized gains |  | 144 | 147
Gross unrealized losses |  | 62 | 73
Gross unrealized OTTI | [1] | (9) | (6)
Fair value |  | 3,581 | 3,614
CMBS [Member] | Fixed maturity AFS securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 423 | 345
Gross unrealized gains |  | 7 | 8
Gross unrealized losses |  | 4 | 4
Gross unrealized OTTI | [1] | (1) | (1)
Fair value |  | 427 | 350
CLOs [Member] | Fixed maturity AFS securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 772 | 742
Gross unrealized gains |  | 3 | 1
Gross unrealized losses |  | 3 | 3
Gross unrealized OTTI | [1] | (4) | (4)
Fair value |  | 776 | 744
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 |  | 4,101 | 3,929
Gross unrealized gains |  | 743 | 718
Gross unrealized losses |  | 18 | 20
Fair value |  | 4,826 | 4,627
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 |  | 584 | 582
Gross unrealized gains |  | 75 | 70
Gross unrealized losses |  | 40 | 48
Fair value |  | $ 619 | 604
VIEs' fixed maturity securities [Member] | Fixed maturity AFS securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  |  | 200
Fair value |  |  | $ 200
[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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