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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
 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
security
Dec. 31, 2020
USD ($)
security
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months $ 276 $ 117
Greater Than Twelve Months 124 81
Continuous Unrealized Loss Position, Total 400 198
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 13,617 4,808
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,593 1,068
Debt Securities, Available-for-sale, Unrealized Loss Position $ 15,210 $ 5,876
Total number of fixed maturity AFS securities in an unrealized loss position | security 1,753 802
Unrealized holding gains (losses) arising during the period $ 8 $ 1
Corporate Bonds [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 218 92
Greater Than Twelve Months 106 58
Continuous Unrealized Loss Position, Total 324 150
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 8,685 3,039
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,289 607
Debt Securities, Available-for-sale, Unrealized Loss Position 9,974 3,646
U.S. Government Bonds [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 1 1
Greater Than Twelve Months 1  
Continuous Unrealized Loss Position, Total 2 1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 29 28
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 3  
Debt Securities, Available-for-sale, Unrealized Loss Position 32 28
State And Municipal Bonds [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 10  
Greater Than Twelve Months 1  
Continuous Unrealized Loss Position, Total 11  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 485  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 17  
Debt Securities, Available-for-sale, Unrealized Loss Position 502  
Foreign Government Bonds [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 6 1
Greater Than Twelve Months 1  
Continuous Unrealized Loss Position, Total 7 1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 152 57
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 28  
Debt Securities, Available-for-sale, Unrealized Loss Position 180 57
RMBS [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 2 1
Greater Than Twelve Months 1  
Continuous Unrealized Loss Position, Total 3 1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 206 45
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 19 7
Debt Securities, Available-for-sale, Unrealized Loss Position 225 52
CMBS [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 9  
Greater Than Twelve Months 1  
Continuous Unrealized Loss Position, Total 10  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 365  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 16  
Debt Securities, Available-for-sale, Unrealized Loss Position 381  
ABS [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 29 9
Greater Than Twelve Months 2 6
Continuous Unrealized Loss Position, Total 31 15
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 3,662 1,527
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 106 358
Debt Securities, Available-for-sale, Unrealized Loss Position 3,768 1,885
Hybrid And Redeemable Preferred Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 1 13
Greater Than Twelve Months 11 17
Continuous Unrealized Loss Position, Total 12 30
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 33 112
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 115 96
Debt Securities, Available-for-sale, Unrealized Loss Position $ 148 $ 208