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Investments (Fair Value And Gross Unrealized Losses In A Continuous Unrealized Loss Position) (Details)
$ in Millions
Sep. 30, 2019
USD ($)
security
Dec. 31, 2018
USD ($)
security
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Total number of AFS securities in an unrealized loss position | security 684 3,414
Fixed Maturity AFS Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months $ 2,965 $ 35,246
Greater Than Twelve Months 2,149 8,671
Fair Value - Total 5,114 43,917
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 45 1,589
Greater Than Twelve Months 224 856
Gross Unrealized Losses - Total 269 2,445
Fixed Maturity AFS Securities [Member] | Corporate Bonds [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 1,743 32,493
Greater Than Twelve Months 1,735 7,228
Fair Value - Total 3,478 39,721
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 39 1,530
Greater Than Twelve Months 190 735
Gross Unrealized Losses - Total 229 2,265
Fixed Maturity AFS Securities [Member] | ABS [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 846 1,241
Greater Than Twelve Months 278 246
Fair Value - Total 1,124 1,487
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 3 23
Greater Than Twelve Months 9 17
Gross Unrealized Losses - Total 12 40
Fixed Maturity AFS Securities [Member] | U.S. Government Bonds [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months   70
Greater Than Twelve Months   23
Fair Value - Total   93
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months   1
Greater Than Twelve Months   1
Gross Unrealized Losses - Total   2
Fixed Maturity AFS Securities [Member] | RMBS [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 238 472
Greater Than Twelve Months 19 863
Fair Value - Total 257 1,335
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 1 10
Greater Than Twelve Months 1 60
Gross Unrealized Losses - Total 2 70
Fixed Maturity AFS Securities [Member] | CMBS [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months   470
Greater Than Twelve Months   82
Fair Value - Total   552
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months   11
Greater Than Twelve Months   5
Gross Unrealized Losses - Total   16
Fixed Maturity AFS Securities [Member] | State And Municipal Bonds [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 138 404
Greater Than Twelve Months 4 96
Fair Value - Total 142 500
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 2 8
Greater Than Twelve Months   10
Gross Unrealized Losses - Total 2 18
Fixed Maturity AFS Securities [Member] | Hybrid And Redeemable Preferred Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months   96
Greater Than Twelve Months 113 133
Fair Value - Total 113 229
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months   6
Greater Than Twelve Months 24 28
Gross Unrealized Losses - Total $ 24 $ 34