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Investments (Fair Value And Gross Unrealized Losses In A Continuous Unrealized Loss Position) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
security
Dec. 31, 2019
USD ($)
security
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Total number of AFS securities in an unrealized loss position | security   895
Fixed Maturity AFS Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months $ 26,979 $ 5,673
Greater Than Twelve Months 1,168 1,848
Fair Value - Total 28,147 7,521
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 2,008 73
Greater Than Twelve Months 328 170
Gross Unrealized Losses - Total $ 2,336 243
Total number of AFS securities in an unrealized loss position | security 2,724  
Unrealized holding gains (losses) arising during the period $ 22  
Fixed Maturity AFS Securities [Member] | Corporate Bonds [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 21,648 2,935
Greater Than Twelve Months 828 1,406
Fair Value - Total 22,476 4,341
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 1,745 46
Greater Than Twelve Months 254 141
Gross Unrealized Losses - Total 1,999 187
Fixed Maturity AFS Securities [Member] | State And Municipal Bonds [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 364 333
Greater Than Twelve Months   18
Fair Value - Total 364 351
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 14 7
Gross Unrealized Losses - Total 14 7
Fixed Maturity AFS Securities [Member] | Foreign Government Bonds [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 27  
Fair Value - Total 27  
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  
Fixed Maturity AFS Securities [Member] | RMBS [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 352 536
Greater Than Twelve Months 5 15
Fair Value - Total 357 551
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 19 10
Greater Than Twelve Months 1  
Gross Unrealized Losses - Total 20 10
Fixed Maturity AFS Securities [Member] | CMBS [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 250 48
Greater Than Twelve Months 2 4
Fair Value - Total 252 52
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 9 1
Gross Unrealized Losses - Total 9 1
Fixed Maturity AFS Securities [Member] | ABS [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 4,160 1,792
Greater Than Twelve Months 255 303
Fair Value - Total 4,415 2,095
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 196 8
Greater Than Twelve Months 36 10
Gross Unrealized Losses - Total 232 18
Fixed Maturity AFS Securities [Member] | Hybrid And Redeemable Preferred Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 178 29
Greater Than Twelve Months 78 102
Fair Value - Total 256 131
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 22 1
Greater Than Twelve Months 37 19
Gross Unrealized Losses - Total $ 59 $ 20