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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 $ 91,219 $ 86,049
Gross unrealized gains 3,851 7,909
Gross unrealized losses 2,326 433
OTTI [1] (43) (61)
Fair value 92,787 93,586
Fixed Maturity Securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 91,219 85,802
Gross unrealized gains   7,893
Gross unrealized losses   416
OTTI [1]   (61)
Fair value 92,787 93,340
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
Corporate Bonds [Member] | Fixed Maturity Securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 78,837 74,921
Gross unrealized gains 2,871 6,573
Gross unrealized losses 2,167 341
OTTI [1] (8) (7)
Fair value 79,549 81,160
ABS [Member] | Fixed Maturity Securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 898 882
Gross unrealized gains 42 51
Gross unrealized losses 6 6
OTTI [1] (14) (26)
Fair value 948 953
U.S. Government Bonds [Member] | Fixed Maturity Securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 361 497
Gross unrealized gains 27 37
Gross unrealized losses 2 1
Fair value 386 533
Foreign Government Bonds [Member] | Fixed Maturity Securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 402 391
Gross unrealized gains 42 55
Fair value 444 446
RMBS [Member] | Fixed Maturity Securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 3,099 3,125
Gross unrealized gains 113 148
Gross unrealized losses 61 36
OTTI [1] (13) (21)
Fair value 3,164 3,258
CMBS [Member] | Fixed Maturity Securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 810 589
Gross unrealized gains 6 10
Gross unrealized losses 16 2
OTTI [1] (3) (2)
Fair value 803 599
CLOs [Member] | Fixed Maturity Securities [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
State And Municipal Bonds [Member] | Fixed Maturity Securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 4,498 4,033
Gross unrealized gains 703 932
Gross unrealized losses 17 6
Fair value 5,184 4,959
Hybrid And Redeemable Preferred Securities [Member] | Fixed Maturity Securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 568 561
Gross unrealized gains 44 85
Gross unrealized losses 33 22
Fair value $ 579 $ 624
[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.