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Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | $ 86,456 | $ 84,747
Gross unrealized gains |  | 7,384 | 5,851
Gross unrealized losses |  | 601 | 1,139
Gross unrealized OTTI | [1] | (50) | (29)
Fair value |  | 93,289 | 89,488
Equity AFS securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 262 | 260
Gross unrealized gains |  | 19 | 19
Gross unrealized losses |  | 6 | 4
Fair value |  | 275 | 275
Fixed maturity AFS securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 86,194 | 84,487
Gross unrealized gains |  | 7,365 | 5,832
Gross unrealized losses |  | 595 | 1,135
Gross unrealized OTTI | [1] | (50) | (29)
Fair value |  | 93,014 | 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 |  | 74,934 | 73,275
Gross unrealized gains |  | 6,108 | 4,754
Gross unrealized losses |  | 500 | 970
Gross unrealized OTTI | [1] | (6) | (5)
Fair value |  | 80,548 | 77,064
ABS [Member] | Fixed maturity AFS securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 996 | 1,047
Gross unrealized gains |  | 46 | 39
Gross unrealized losses |  | 12 | 14
Gross unrealized OTTI | [1] | (20) | (13)
Fair value |  | 1,050 | 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 |  | 536 | 384
Gross unrealized gains |  | 44 | 37
Gross unrealized losses |  | 2 | 2
Fair value |  | 578 | 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 |  | 397 | 449
Gross unrealized gains |  | 58 | 58
Gross unrealized losses |  |  | 1
Fair value |  | 455 | 506
RMBS [Member] | Fixed maturity AFS securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 3,412 | 3,534
Gross unrealized gains |  | 160 | 147
Gross unrealized losses |  | 38 | 73
Gross unrealized OTTI | [1] | (18) | (6)
Fair value |  | 3,552 | 3,614
CMBS [Member] | Fixed maturity AFS securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 466 | 345
Gross unrealized gains |  | 10 | 8
Gross unrealized losses |  | 2 | 4
Gross unrealized OTTI | [1] | (2) | (1)
Fair value |  | 476 | 350
CLOs [Member] | Fixed maturity AFS securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 697 | 742
Gross unrealized gains |  | 4 | 1
Gross unrealized losses |  | 2 | 3
Gross unrealized OTTI | [1] | (4) | (4)
Fair value |  | 703 | 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 |  | 4,172 | 3,929
Gross unrealized gains |  | 850 | 718
Gross unrealized losses |  | 12 | 20
Fair value |  | 5,010 | 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 |  | 85 | 70
Gross unrealized losses |  | 27 | 48
Fair value |  | $ 642 | 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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