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Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost $ 92,894 $ 92,429
Gross unrealized gains 6,055 3,981
Gross unrealized losses 933 2,430
OTTI [1] (34) (44)
Fair value 98,050 94,024
Fixed Maturity AFS Securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 92,894  
Fair value 98,050  
Fixed Maturity AFS Securities [Member] | Corporate Bonds [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 79,243 79,623
Gross unrealized gains 4,813 2,980
Gross unrealized losses 838 2,263
OTTI [1] 10 (8)
Fair value 83,208 80,348
Fixed Maturity AFS Securities [Member] | ABS [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 990 916
Gross unrealized gains 46 42
Gross unrealized losses 6 6
OTTI [1] (17) (14)
Fair value 1,047 966
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 387 390
Gross unrealized gains 37 29
Gross unrealized losses 1 2
Fair value 423 417
Fixed Maturity AFS Securities [Member] | Foreign Government Bonds [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 403 406
Gross unrealized gains 50 42
Fair value 453 448
Fixed Maturity AFS Securities [Member] | RMBS [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 3,296 3,308
Gross unrealized gains 142 118
Gross unrealized losses 42 67
OTTI [1] (18) (14)
Fair value 3,414 3,373
Fixed Maturity AFS Securities [Member] | CMBS [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 868 811
Gross unrealized gains 16 6
Gross unrealized losses 3 16
OTTI [1] (4) (3)
Fair value 885 804
Fixed Maturity AFS Securities [Member] | CLOs [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 2,439 1,746
Gross unrealized gains 4 3
Gross unrealized losses 11 24
OTTI [1] (5) (5)
Fair value 2,437 1,730
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 4,687 4,647
Gross unrealized gains 890 716
Gross unrealized losses 8 18
Fair value 5,569 5,345
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 581 582
Gross unrealized gains 57 45
Gross unrealized losses 24 34
Fair value $ 614 $ 593
[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.