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Investments (Fair Value And Gross Unrealized Losses In A Continuous Unrealized Loss Position) (Details)
$ in Millions
9 Months Ended
Sep. 30, 2020
USD ($)
security
Dec. 31, 2019
USD ($)
security
Schedule of Available-for-sale Securities [Line Items]    
Total number of fixed maturity AFS securities in an unrealized loss position | security 1,191 882
Fixed Maturity AFS Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months $ 9,046 $ 5,482
Greater Than Twelve Months 1,110 1,820
Fair Value - Total 10,156 7,302
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 286 70
Greater Than Twelve Months 126 159
Gross Unrealized Losses - Total 412 229
Unrealized holding gains (losses) arising during the period 3  
Corporate Bonds [Member] | Fixed Maturity AFS Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 5,323 2,827
Greater Than Twelve Months 648 1,381
Fair Value - Total 5,971 4,208
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 246 44
Greater Than Twelve Months 95 131
Gross Unrealized Losses - Total 341 175
ABS [Member] | Fixed Maturity AFS Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 3,327 1,791
Greater Than Twelve Months 369 300
Fair Value - Total 3,696 2,091
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 9
Gross Unrealized Losses - Total 22 17
Foreign Government Bonds [Member] | Fixed Maturity AFS Securities [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] | Fixed Maturity AFS Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months   471
Greater Than Twelve Months   15
Fair Value - Total   486
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months   9
Gross Unrealized Losses - Total   9
CMBS [Member] | Fixed Maturity AFS Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 53 48
Greater Than Twelve Months 1 4
Fair Value - Total 54 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
State And Municipal Bonds [Member] | Fixed Maturity AFS Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 183 316
Greater Than Twelve Months   18
Fair Value - Total 183 334
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
Hybrid And Redeemable Preferred Securities [Member] | Fixed Maturity AFS Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 111 29
Greater Than Twelve Months 92 102
Fair Value - Total 203 131
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