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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
Schedule of Available-for-sale Securities [Line Items]    
Total number of fixed maturity AFS securities in an unrealized loss position | security 1,737 782
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months $ 13,378 $ 4,552
Greater Than Twelve Months 1,409 1,045
Fair Value - Total 14,787 5,597
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 269 110
Greater Than Twelve Months 103 74
Gross Unrealized Losses - Total 372 184
Unrealized holding gains (losses) arising during the period 8 1
Corporate Bonds [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 8,487 2,785
Greater Than Twelve Months 1,115 588
Fair Value - Total 9,602 3,373
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 213 85
Greater Than Twelve Months 84 51
Gross Unrealized Losses - Total 297 136
U.S. Government Bonds [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 29 28
Greater Than Twelve Months 3  
Fair Value - Total 32 28
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  
Gross Unrealized Losses - Total 2 1
State And Municipal Bonds [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 455  
Greater Than Twelve Months 12  
Fair Value - Total 467  
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  
Gross Unrealized Losses - Total 10  
Foreign Government Bonds [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 148 57
Greater Than Twelve Months 28  
Fair Value - Total 176 57
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 5 1
Greater Than Twelve Months 2  
Gross Unrealized Losses - Total 7 1
RMBS [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 205 43
Greater Than Twelve Months 17 6
Fair Value - Total 222 49
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  
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 360  
Greater Than Twelve Months 12  
Fair Value - Total 372  
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  
Gross Unrealized Losses - Total 10  
ABS [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 3,661 1,527
Greater Than Twelve Months 107 355
Fair Value - Total 3,768 1,882
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
Gross Unrealized Losses - Total 31 15
Hybrid And Redeemable Preferred Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 33 112
Greater Than Twelve Months 115 96
Fair Value - Total 148 208
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
Gross Unrealized Losses - Total $ 12 $ 30