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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
Schedule of Available-for-sale Securities [Line Items]    
Total number of fixed maturity AFS securities in an unrealized loss position | security 2,670 882
Fixed Maturity AFS Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months $ 26,215 $ 5,482
Greater Than Twelve Months 1,151 1,820
Fair Value - Total 27,366 7,302
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 1,938 70
Greater Than Twelve Months 314 159
Gross Unrealized Losses - Total 2,252 229
Unrealized holding gains (losses) arising during the period 20  
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 20,927 2,827
Greater Than Twelve Months 814 1,381
Fair Value - Total 21,741 4,208
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 1,677 44
Greater Than Twelve Months 242 131
Gross Unrealized Losses - Total 1,919 175
ABS [Member] | Fixed Maturity AFS Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 4,159 1,791
Greater Than Twelve Months 252 300
Fair Value - Total 4,411 2,091
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 35 9
Gross Unrealized Losses - Total 231 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 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  
RMBS [Member] | Fixed Maturity AFS Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 338 471
Greater Than Twelve Months 5 15
Fair Value - Total 343 486
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 18 9
Greater Than Twelve Months 1  
Gross Unrealized Losses - Total 19 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 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
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 340 316
Greater Than Twelve Months   18
Fair Value - Total 340 334
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 13 7
Gross Unrealized Losses - Total 13 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 174 29
Greater Than Twelve Months 78 102
Fair Value - Total 252 131
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 36 19
Gross Unrealized Losses - Total $ 58 $ 20