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Investments (Fair Value And Gross Unrealized Losses In A Continuous Unrealized Loss Position) (Details) - Fixed Maturity AFS Securities [Member]
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
security
Dec. 31, 2020
USD ($)
security
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months $ 16,016 $ 4,808
Greater Than Twelve Months 974 1,068
Fair Value - Total 16,990 5,876
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 727 117
Greater Than Twelve Months 76 81
Gross Unrealized Losses - Total $ 803 $ 198
Total number of fixed maturity AFS securities in an unrealized loss position | security 1,749 802
Unrealized holding gains (losses) arising during the period $ 2 $ 1
Corporate Bonds [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 12,029 3,039
Greater Than Twelve Months 709 607
Fair Value - Total 12,738 3,646
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 633 92
Greater Than Twelve Months 60 58
Gross Unrealized Losses - Total 693 150
U.S. Government Bonds [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 25 28
Fair Value - Total 25 28
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 3 1
Gross Unrealized Losses - Total 3 1
State And Municipal Bonds [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 767  
Fair Value - Total 767  
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 34  
Gross Unrealized Losses - Total 34  
Foreign Government Bonds [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 99 57
Fair Value - Total 99 57
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 6 1
Gross Unrealized Losses - Total 6 1
RMBS [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 200 45
Greater Than Twelve Months 7 7
Fair Value - Total 207 52
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 3 1
Gross Unrealized Losses - Total 3 1
CMBS [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 371  
Fair Value - Total 371  
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 16  
Gross Unrealized Losses - Total 16  
ABS [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 2,401 1,527
Greater Than Twelve Months 167 358
Fair Value - Total 2,568 1,885
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 24 9
Greater Than Twelve Months 3 6
Gross Unrealized Losses - Total 27 15
Hybrid And Redeemable Preferred Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 124 112
Greater Than Twelve Months 91 96
Fair Value - Total 215 208
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 8 13
Greater Than Twelve Months 13 17
Gross Unrealized Losses - Total $ 21 $ 30