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Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost $ 84,747 $ 82,815
Gross unrealized gains 5,851 5,061
Gross unrealized losses 1,139 2,107
Gross unrealized OTTI [1] (29) (30)
Fair value 89,488 85,799
Equity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 260 226
Gross unrealized gains 19 17
Gross unrealized losses 4 6
Fair value 275 237
Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 84,487 82,589
Gross unrealized gains 5,832 5,044
Gross unrealized losses 1,135 2,101
Gross unrealized OTTI [1] (29) (30)
Fair value 89,213 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 73,275 70,993
Gross unrealized gains 4,754 3,924
Gross unrealized losses 970 1,984
Gross unrealized OTTI [1] (5) 2
Fair value 77,064 72,931
ABS [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 1,047 1,064
Gross unrealized gains 39 41
Gross unrealized losses 14 17
Gross unrealized OTTI [1] (13) (13)
Fair value 1,085 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 384 386
Gross unrealized gains 37 45
Gross unrealized losses 2 2
Fair value 419 429
Foreign government bonds [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 449 464
Gross unrealized gains 58 61
Gross unrealized losses 1 1
Fair value 506 524
RMBS [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 3,534 3,566
Gross unrealized gains 147 186
Gross unrealized losses 73 36
Gross unrealized OTTI [1] (6) (12)
Fair value 3,614 3,728
CMBS [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 345 364
Gross unrealized gains 8 10
Gross unrealized losses 4 2
Gross unrealized OTTI [1] (1) (4)
Fair value 350 376
CLOs [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 742 588
Gross unrealized gains 1 1
Gross unrealized losses 3 3
Gross unrealized OTTI [1] (4) (3)
Fair value 744 589
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 3,929 3,806
Gross unrealized gains 718 686
Gross unrealized losses 20 12
Fair value 4,627 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 582 762
Gross unrealized gains 70 88
Gross unrealized losses 48 44
Fair value 604 806
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 200 596
Gross unrealized gains   2
Fair value $ 200 $ 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.