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Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost $ 82,815 $ 79,412
Gross unrealized gains 5,061 8,164
Gross unrealized losses 2,107 524
Gross unrealized OTTI [1] (30) (17)
Fair value 85,799 87,069
Available-for-sale equity securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 226 216
Gross unrealized gains 17 15
Gross unrealized losses 6  
Fair value 237 231
Fixed Maturity AFS Securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 82,589 79,196
Gross unrealized gains 5,044 8,149
Gross unrealized losses 2,101 524
Gross unrealized OTTI [1] (30) (17)
Fair value 85,562 86,838
Corporate bonds [Member] | Fixed Maturity AFS Securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 70,993 67,153
Gross unrealized gains 3,924 6,711
Gross unrealized losses 1,984 443
Gross unrealized OTTI [1] 2 5
Fair value 72,931 73,416
ABS [Member] | Fixed Maturity AFS Securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 1,064 1,087
Gross unrealized gains 41 56
Gross unrealized losses 17 20
Gross unrealized OTTI [1] (13) (7)
Fair value 1,101 1,130
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 386 379
Gross unrealized gains 45 56
Gross unrealized losses 2  
Fair value 429 435
Foreign government bonds [Member] | Fixed Maturity AFS Securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 464 473
Gross unrealized gains 61 68
Gross unrealized losses 1  
Fair value 524 541
RMBS [Member] | Fixed Maturity AFS Securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 3,566 3,979
Gross unrealized gains 186 242
Gross unrealized losses 36 14
Gross unrealized OTTI [1] (12) (19)
Fair value 3,728 4,226
CMBS [Member] | Fixed Maturity AFS Securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 364 554
Gross unrealized gains 10 23
Gross unrealized losses 2 1
Gross unrealized OTTI [1] (4) 6
Fair value 376 570
CLOs [Member] | Fixed Maturity AFS Securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 588 375
Gross unrealized gains 1  
Gross unrealized losses 3 2
Gross unrealized OTTI [1] (3) (2)
Fair value 589 375
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 3,806 3,723
Gross unrealized gains 686 874
Gross unrealized losses 12 4
Fair value 4,480 4,593
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 762 886
Gross unrealized gains 88 108
Gross unrealized losses 44 40
Fair value 806 954
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 596 587
Gross unrealized gains 2 11
Fair value $ 598 $ 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.