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Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost $ 92,429 $ 87,240
Gross unrealized gains 3,981 8,233
Gross unrealized losses 2,430 450
OTTI [1] (44) (63)
Fair value 94,024 95,086
Fixed Maturity AFS Securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 92,429 86,993
Gross unrealized gains   8,217
Gross unrealized losses   433
OTTI [1]   (63)
Fair value 94,024 94,840
Fixed Maturity AFS Securities [Member] | Corporate Bonds [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 79,623 75,701
Gross unrealized gains 2,980 6,862
Gross unrealized losses 2,263 354
OTTI [1] (8) (7)
Fair value 80,348 82,216
Fixed Maturity AFS Securities [Member] | ABS [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 916 903
Gross unrealized gains 42 51
Gross unrealized losses 6 7
OTTI [1] (14) (27)
Fair value 966 974
Fixed Maturity AFS Securities [Member] | U.S. Government Bonds [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 390 527
Gross unrealized gains 29 41
Gross unrealized losses 2 1
Fair value 417 567
Fixed Maturity AFS Securities [Member] | Foreign Government Bonds [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 406 395
Gross unrealized gains 42 56
Fair value 448 451
Fixed Maturity AFS Securities [Member] | RMBS [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 3,308 3,327
Gross unrealized gains 118 155
Gross unrealized losses 67 39
OTTI [1] (14) (22)
Fair value 3,373 3,465
Fixed Maturity AFS Securities [Member] | CMBS [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 811 590
Gross unrealized gains 6 10
Gross unrealized losses 16 2
OTTI [1] (3) (2)
Fair value 804 600
Fixed Maturity AFS Securities [Member] | CLOs [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 1,746 803
Gross unrealized gains 3 2
Gross unrealized losses 24 2
OTTI [1] (5) (5)
Fair value 1,730 808
Fixed Maturity AFS Securities [Member] | State And Municipal Bonds [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 4,647 4,172
Gross unrealized gains 716 953
Gross unrealized losses 18 6
Fair value 5,345 5,119
Fixed Maturity AFS Securities [Member] | Hybrid And Redeemable Preferred Securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 582 575
Gross unrealized gains 45 87
Gross unrealized losses 34 22
Fair value $ 593 640
Equity AFS 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
[1] Includes unrealized (gains) and losses on credit-impaired securities related to changes in the fair value of such securities subsequent to the impairment measurement date.