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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
Sep. 30, 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 $ 9,460 $ 5,673
Greater Than Twelve Months 1,125 1,848
Fair Value - Total 10,585 7,521
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 304 73
Greater Than Twelve Months 134 170
Gross Unrealized Losses - Total $ 438 $ 243
Total number of AFS securities in an unrealized loss position | security 1,223 895
Unrealized holding gains (losses) arising during the period $ 3  
Corporate Bonds [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 5,719 $ 2,935
Greater Than Twelve Months 660 1,406
Fair Value - Total 6,379 4,341
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 264 46
Greater Than Twelve Months 103 141
Gross Unrealized Losses - Total 367 187
State And Municipal Bonds [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 194 333
Greater Than Twelve Months   18
Fair Value - Total 194 351
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 3 7
Gross Unrealized Losses - Total 3 7
Foreign Government Bonds [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 49  
Fair Value - Total 49  
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 3  
Gross Unrealized Losses - Total 3  
RMBS [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months   536
Greater Than Twelve Months   15
Fair Value - Total   551
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months   10
Gross Unrealized Losses - Total   10
CMBS [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 59 48
Greater Than Twelve Months 1 4
Fair Value - Total 60 52
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 1 1
Gross Unrealized Losses - Total 1 1
ABS [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 3,327 1,792
Greater Than Twelve Months 372 303
Fair Value - Total 3,699 2,095
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 13 8
Greater Than Twelve Months 9 10
Gross Unrealized Losses - Total 22 18
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 92 102
Fair Value - Total 204 131
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 20 1
Greater Than Twelve Months 22 19
Gross Unrealized Losses - Total $ 42 $ 20