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Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost $ 87,267 $ 87,240
Gross unrealized gains 5,800 8,233
Gross unrealized losses 1,062 450
OTTI [1] (54) (63)
Fair value 92,059 95,086
Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 87,267 86,993
Gross unrealized gains   8,217
Gross unrealized losses   433
OTTI [1]   (63)
Fair value 92,059 94,840
Equity Securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost   247
Gross unrealized gains   16
Gross unrealized losses   17
Fair value   246
Corporate Bonds [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 76,036 75,701
Gross unrealized gains 4,647 6,862
Gross unrealized losses 932 354
OTTI [1] (8) (7)
Fair value 79,759 82,216
ABS [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 868 903
Gross unrealized gains 46 51
Gross unrealized losses 8 7
OTTI [1] (15) (27)
Fair value 921 974
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 373 527
Gross unrealized gains 31 41
Gross unrealized losses 3 1
Fair value 401 567
Foreign Government Bonds [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 394 395
Gross unrealized gains 46 56
Fair value 440 451
RMBS [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 3,291 3,327
Gross unrealized gains 132 155
Gross unrealized losses 72 39
OTTI [1] (23) (22)
Fair value 3,374 3,465
CMBS [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 669 590
Gross unrealized gains 5 10
Gross unrealized losses 14 2
OTTI [1] (3) (2)
Fair value 663 600
CLOs [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 872 803
Gross unrealized gains 1 2
Gross unrealized losses 3 2
OTTI [1] (5) (5)
Fair value 875 808
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 4,190 4,172
Gross unrealized gains 820 953
Gross unrealized losses 10 6
Fair value 5,000 5,119
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 574 575
Gross unrealized gains 72 87
Gross unrealized losses 20 22
Fair value $ 626 $ 640
[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.