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Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost $ 83,890 $ 82,815
Gross unrealized gains 9,165 5,061
Gross unrealized losses 716 2,107
Gross unrealized OTTI [1] 1 (30)
Fair value 92,338 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 23 17
Gross unrealized losses 5 6
Fair value 277 237
Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 83,631 82,589
Gross unrealized gains 9,142 5,044
Gross unrealized losses 711 2,101
Gross unrealized OTTI [1] 1 (30)
Fair value 92,061 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 72,157 70,993
Gross unrealized gains 7,508 3,924
Gross unrealized losses 599 1,984
Gross unrealized OTTI [1] 15 2
Fair value 79,051 72,931
ABS [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 1,041 1,064
Gross unrealized gains 46 41
Gross unrealized losses 17 17
Gross unrealized OTTI [1] (8) (13)
Fair value 1,078 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 78 45
Gross unrealized losses   2
Fair value 464 429
Foreign government bonds [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 454 464
Gross unrealized gains 76 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 3,445 3,566
Gross unrealized gains 224 186
Gross unrealized losses 32 36
Gross unrealized OTTI [1]   (12)
Fair value 3,637 3,728
CMBS [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 319 364
Gross unrealized gains 16 10
Gross unrealized losses   2
Gross unrealized OTTI [1] (3) (4)
Fair value 338 376
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 2 1
Gross unrealized losses 1 3
Gross unrealized OTTI [1] (4) (3)
Fair value 687 589
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 3,872 3,806
Gross unrealized gains 1,119 686
Gross unrealized losses 5 12
Gross unrealized OTTI [1] 1  
Fair value 4,985 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 677 762
Gross unrealized gains 71 88
Gross unrealized losses 57 44
Fair value 691 806
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 598 596
Gross unrealized gains 2 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.