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Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost $ 90,083 $ 87,240
Gross unrealized gains 4,661 8,233
Gross unrealized losses 1,740 450
OTTI [1] (56) (63)
Fair value 93,060 95,086
Fixed Maturity AFS Securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 90,083 86,993
Gross unrealized gains   8,217
Gross unrealized losses   433
OTTI [1]   (63)
Fair value 93,060 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 78,009 75,701
Gross unrealized gains 3,605 6,862
Gross unrealized losses 1,582 354
OTTI [1] (9) (7)
Fair value 80,041 82,216
ABS [Member] | Fixed Maturity AFS Securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 964 903
Gross unrealized gains 44 51
Gross unrealized losses 7 7
OTTI [1] (17) (27)
Fair value 1,018 974
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 396 527
Gross unrealized gains 29 41
Gross unrealized losses 3 1
Fair value 422 567
Foreign Government Bonds [Member] | Fixed Maturity AFS Securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 430 395
Gross unrealized gains 41 56
Fair value 471 451
RMBS [Member] | Fixed Maturity AFS Securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 3,317 3,327
Gross unrealized gains 119 155
Gross unrealized losses 84 39
OTTI [1] (22) (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 759 590
Gross unrealized gains 5 10
Gross unrealized losses 20 2
OTTI [1] (3) (2)
Fair value 747 600
CLOs [Member] | Fixed Maturity AFS Securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 1,121 803
Gross unrealized gains   2
Gross unrealized losses 7 2
OTTI [1] (5) (5)
Fair value 1,119 808
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 4,509 4,172
Gross unrealized gains 753 953
Gross unrealized losses 14 6
Fair value 5,248 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 578 575
Gross unrealized gains 65 87
Gross unrealized losses 23 22
Fair value $ 620 $ 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.