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Investments (Fair Value And Gross Unrealized Losses In A Continuous Unrealized Loss Position) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
security
Dec. 31, 2019
USD ($)
security
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months $ 4,808 $ 5,673
Greater Than Twelve Months 1,068 1,848
Fair Value - Total 5,876 7,521
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 117 73
Greater Than Twelve Months 81 170
Gross Unrealized Losses - Total $ 198 $ 243
Total number of fixed maturity AFS securities in an unrealized loss position | security 802 895
Fixed Maturity AFS Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Unrealized holding gains (losses) arising during the period $ 1  
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 3,039 $ 2,935
Greater Than Twelve Months 607 1,406
Fair Value - Total 3,646 4,341
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 92 46
Greater Than Twelve Months 58 141
Gross Unrealized Losses - Total 150 187
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 28  
Fair Value - Total 28  
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 1  
Gross Unrealized Losses - Total 1  
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
Greater Than Twelve Months   18
Fair Value - Total   351
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months   7
Gross Unrealized Losses - Total   7
Fixed Maturity AFS Securities [Member] | Foreign Government Bonds [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 57  
Fair Value - Total 57  
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 1  
Gross Unrealized Losses - Total 1  
Fixed Maturity AFS Securities [Member] | RMBS [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 45 536
Greater Than Twelve Months 7 15
Fair Value - Total 52 551
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 1 10
Gross Unrealized Losses - Total 1 10
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
Greater Than Twelve Months   4
Fair Value - Total   52
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months   1
Gross Unrealized Losses - Total   1
Fixed Maturity AFS Securities [Member] | ABS [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 1,527 1,792
Greater Than Twelve Months 358 303
Fair Value - Total 1,885 2,095
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 9 8
Greater Than Twelve Months 6 10
Gross Unrealized Losses - Total 15 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 112 29
Greater Than Twelve Months 96 102
Fair Value - Total 208 131
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 13 1
Greater Than Twelve Months 17 19
Gross Unrealized Losses - Total $ 30 $ 20