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Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost $ 81,726 $ 79,412
Gross unrealized gains 6,071 8,164
Gross unrealized losses 1,476 524
Gross Unrealized OTTI [1] (25) (17)
Fair value 86,346 87,069
Equity AFS Securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 232 216
Gross unrealized gains 15 15
Gross unrealized losses 5  
Fair value 242 231
Fixed Maturity AFS Securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 81,494 79,196
Gross unrealized gains 6,056 8,149
Gross unrealized losses 1,471 524
Gross Unrealized OTTI [1] (25) (17)
Fair value 86,104 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 69,836 67,153
Gross unrealized gains 4,836 6,711
Gross unrealized losses 1,374 443
Gross Unrealized OTTI [1] 7 5
Fair value 73,291 73,416
ABS [Member] | Fixed Maturity AFS Securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 1,089 1,087
Gross unrealized gains 53 56
Gross unrealized losses 15 20
Gross Unrealized OTTI [1] (14) (7)
Fair value 1,141 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 53 56
Gross unrealized losses 1  
Fair value 438 435
Foreign Government Bonds [Member] | Fixed Maturity AFS Securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 466 473
Gross unrealized gains 67 68
Gross unrealized losses 1  
Fair value 532 541
RMBS [Member] | Fixed Maturity AFS Securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 3,638 3,979
Gross unrealized gains 217 242
Gross unrealized losses 21 14
Gross Unrealized OTTI [1] (15) (19)
Fair value 3,849 4,226
CMBS [Member] | Fixed Maturity AFS Securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 388 554
Gross unrealized gains 15 23
Gross unrealized losses 1 1
Gross Unrealized OTTI [1] (1) 6
Fair value 403 570
CLOs [Member] | Fixed Maturity AFS Securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 511 375
Gross unrealized gains 3  
Gross unrealized losses 1 2
Gross Unrealized OTTI [1] (2) (2)
Fair value 515 375
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 3,778 3,723
Gross unrealized gains 716 874
Gross unrealized losses 14 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 807 886
Gross unrealized gains 93 108
Gross unrealized losses 43 40
Fair value 857 954
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 595 587
Gross unrealized gains 3 11
Fair value $ 598 $ 598
[1] Includes unrealized gains (losses) on impaired securities related to changes in the fair value of such securities subsequent to the impairment measurement date.