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Investments (Fair Value And Gross Unrealized Losses In A Continuous Unrealized Loss Position) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
security
Dec. 31, 2018
USD ($)
security
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months $ 5,673 $ 35,246
Greater Than Twelve Months 1,848 8,671
Fair Value - Total 7,521 43,917
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 73 1,589
Greater Than Twelve Months 170 856
Gross Unrealized Losses - Total $ 243 $ 2,445
Total number of AFS securities in an unrealized loss position | security 895 3,414
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 $ 2,935 $ 32,493
Greater Than Twelve Months 1,406 7,228
Fair Value - Total 4,341 39,721
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 46 1,530
Greater Than Twelve Months 141 735
Gross Unrealized Losses - Total 187 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 1,792 1,241
Greater Than Twelve Months 303 246
Fair Value - Total 2,095 1,487
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 8 23
Greater Than Twelve Months 10 17
Gross Unrealized Losses - Total 18 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 536 472
Greater Than Twelve Months 15 863
Fair Value - Total 551 1,335
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 10 10
Greater Than Twelve Months   60
Gross Unrealized Losses - Total 10 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 48 470
Greater Than Twelve Months 4 82
Fair Value - Total 52 552
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 1 11
Greater Than Twelve Months   5
Gross Unrealized Losses - Total 1 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 333 404
Greater Than Twelve Months 18 96
Fair Value - Total 351 500
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 7 8
Greater Than Twelve Months   10
Gross Unrealized Losses - Total 7 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 29 96
Greater Than Twelve Months 102 133
Fair Value - Total 131 229
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 1 6
Greater Than Twelve Months 19 28
Gross Unrealized Losses - Total $ 20 $ 34