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Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | $ 86,889 | $ 84,747
Gross unrealized gains |  | 7,638 | 5,851
Gross unrealized losses |  | 515 | 1,139
OTTI | [1] | (57) | (29)
Fair value |  | 94,069 | 89,488
Equity AFS securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 296 | 260
Gross unrealized gains |  | 19 | 19
Gross unrealized losses |  | 13 | 4
Fair value |  | 302 | 275
Fixed maturity AFS securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 86,593 | 84,487
Gross unrealized gains |  | 7,619 | 5,832
Gross unrealized losses |  | 502 | 1,135
OTTI | [1] | (57) | (29)
Fair value |  | 93,767 | 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 |  | 75,400 | 73,275
Gross unrealized gains |  | 6,317 | 4,754
Gross unrealized losses |  | 421 | 970
OTTI | [1] | (5) | (5)
Fair value |  | 81,301 | 77,064
ABS [Member] | Fixed maturity AFS securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 951 | 1,047
Gross unrealized gains |  | 51 | 39
Gross unrealized losses |  | 7 | 14
OTTI | [1] | (23) | (13)
Fair value |  | 1,018 | 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 |  | 533 | 384
Gross unrealized gains |  | 43 | 37
Gross unrealized losses |  | 2 | 2
Fair value |  | 574 | 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 |  | 396 | 449
Gross unrealized gains |  | 59 | 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 |  | 3,339 | 3,534
Gross unrealized gains |  | 171 | 147
Gross unrealized losses |  | 38 | 73
OTTI | [1] | (22) | (6)
Fair value |  | 3,494 | 3,614
CMBS [Member] | Fixed maturity AFS securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 532 | 345
Gross unrealized gains |  | 10 | 8
Gross unrealized losses |  | 2 | 4
OTTI | [1] | (3) | (1)
Fair value |  | 543 | 350
CLOs [Member] | Fixed maturity AFS securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 687 | 742
Gross unrealized gains |  | 4 | 1
Gross unrealized losses |  | 1 | 3
OTTI | [1] | (4) | (4)
Fair value |  | 694 | 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 |  | 4,180 | 3,929
Gross unrealized gains |  | 877 | 718
Gross unrealized losses |  | 8 | 20
Fair value |  | 5,049 | 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 |  | 575 | 582
Gross unrealized gains |  | 87 | 70
Gross unrealized losses |  | 23 | 48
Fair value |  | $ 639 | 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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