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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
6 Months Ended
Jun. 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 $ 9,972 $ 5,673
Greater Than Twelve Months 1,154 1,848
Fair Value - Total 11,126 7,521
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 441 73
Greater Than Twelve Months 158 170
Gross Unrealized Losses - Total $ 599 $ 243
Total number of AFS securities in an unrealized loss position | security 1,284 895
Unrealized holding gains (losses) arising during the period $ 1  
Corporate Bonds [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 5,916 $ 2,935
Greater Than Twelve Months 732 1,406
Fair Value - Total 6,648 4,341
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 364 46
Greater Than Twelve Months 116 141
Gross Unrealized Losses - Total 480 187
State And Municipal Bonds [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 83 333
Greater Than Twelve Months   18
Fair Value - Total 83 351
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 2 7
Gross Unrealized Losses - Total 2 7
Foreign Government Bonds [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 47  
Fair Value - Total 47  
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 69 536
Greater Than Twelve Months 5 15
Fair Value - Total 74 551
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 2 10
Gross Unrealized Losses - Total 2 10
CMBS [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 29 48
Greater Than Twelve Months 1 4
Fair Value - Total 30 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 3,726 1,792
Greater Than Twelve Months 331 303
Fair Value - Total 4,057 2,095
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 46 8
Greater Than Twelve Months 14 10
Gross Unrealized Losses - Total 60 18
Hybrid And Redeemable Preferred Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 102 29
Greater Than Twelve Months 85 102
Fair Value - Total 187 131
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 23 1
Greater Than Twelve Months 28 19
Gross Unrealized Losses - Total $ 51 $ 20