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Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost $ 84,571 $ 82,815
Gross unrealized gains 9,435 5,061
Gross unrealized losses 523 2,107
Gross unrealized OTTI [1] (22) (30)
Fair value 93,505 85,799
Equity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 259 226
Gross unrealized gains 18 17
Gross unrealized losses 4 6
Fair value 273 237
Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 84,312 82,589
Gross unrealized gains 9,417 5,044
Gross unrealized losses 519 2,101
Gross unrealized OTTI [1] (22) (30)
Fair value 93,232 85,562
Corporate bonds [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 72,863 70,993
Gross unrealized gains 7,822 3,924
Gross unrealized losses 431 1,984
Gross unrealized OTTI [1] 1 2
Fair value 80,253 72,931
ABS [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 1,058 1,064
Gross unrealized gains 57 41
Gross unrealized losses 11 17
Gross unrealized OTTI [1] (12) (13)
Fair value 1,116 1,101
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 386 386
Gross unrealized gains 72 45
Gross unrealized losses   2
Fair value 458 429
Foreign government bonds [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 451 464
Gross unrealized gains 79 61
Gross unrealized losses   1
Fair value 530 524
RMBS [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 3,505 3,566
Gross unrealized gains 214 186
Gross unrealized losses 23 36
Gross unrealized OTTI [1] (7) (12)
Fair value 3,703 3,728
CMBS [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 298 364
Gross unrealized gains 17 10
Gross unrealized losses   2
Gross unrealized OTTI [1] (1) (4)
Fair value 316 376
CLOs [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 682 588
Gross unrealized gains 1 1
Gross unrealized losses 1 3
Gross unrealized OTTI [1] (4) (3)
Fair value 686 589
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 3,874 3,806
Gross unrealized gains 1,070 686
Gross unrealized losses 4 12
Gross unrealized OTTI [1] 1  
Fair value 4,939 4,480
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 596 762
Gross unrealized gains 84 88
Gross unrealized losses 49 44
Fair value 631 806
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 599 596
Gross unrealized gains 1 2
Fair value $ 600 $ 598
[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.