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Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost $ 83,451 $ 82,815
Gross unrealized gains 6,898 5,061
Gross unrealized losses 1,431 2,107
Gross unrealized OTTI [1] 10 (30)
Fair value 88,908 85,799
Equity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 231 226
Gross unrealized gains 20 17
Gross unrealized losses 6 6
Fair value 245 237
Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 83,220 82,589
Gross unrealized gains 6,878 5,044
Gross unrealized losses 1,425 2,101
Gross unrealized OTTI [1] 10 (30)
Fair value 88,663 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 71,706 70,993
Gross unrealized gains 5,516 3,924
Gross unrealized losses 1,304 1,984
Gross unrealized OTTI [1] 21 2
Fair value 75,897 72,931
ABS [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 1,029 1,064
Gross unrealized gains 44 41
Gross unrealized losses 21 17
Gross unrealized OTTI [1] (7) (13)
Fair value 1,059 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 387 386
Gross unrealized gains 64 45
Gross unrealized losses 1 2
Fair value 450 429
Foreign government bonds [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 463 464
Gross unrealized gains 69 61
Gross unrealized losses   1
Fair value 532 524
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 208 186
Gross unrealized losses 35 36
Gross unrealized OTTI [1] (1) (12)
Fair value 3,679 3,728
CMBS [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 336 364
Gross unrealized gains 10 10
Gross unrealized losses   2
Gross unrealized OTTI [1] (3) (4)
Fair value 349 376
CLOs [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 627 588
Gross unrealized gains 3 1
Gross unrealized losses 3 3
Gross unrealized OTTI [1] (1) (3)
Fair value 628 589
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 3,873 3,806
Gross unrealized gains 881 686
Gross unrealized losses 9 12
Gross unrealized OTTI [1] 1  
Fair value 4,744 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 697 762
Gross unrealized gains 81 88
Gross unrealized losses 52 44
Fair value 726 806
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 597 596
Gross unrealized gains 2 2
Fair value $ 599 $ 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.