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Investments (Fair Value And Gross Unrealized Losses In A Continuous Unrealized Loss Position) (Details)
$ in Millions
6 Months Ended
Jun. 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 1,239 882
Fixed Maturity AFS Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months $ 9,692 $ 5,482
Greater Than Twelve Months 1,141 1,820
Fair Value - Total 10,833 7,302
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 424 70
Greater Than Twelve Months 151 159
Gross Unrealized Losses - Total 575 229
Unrealized holding gains (losses) arising during the period 1  
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 5,645 2,827
Greater Than Twelve Months 722 1,381
Fair Value - Total 6,367 4,208
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 347 44
Greater Than Twelve Months 109 131
Gross Unrealized Losses - Total 456 175
ABS [Member] | Fixed Maturity AFS Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 3,726 1,791
Greater Than Twelve Months 328 300
Fair Value - Total 4,054 2,091
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 9
Gross Unrealized Losses - Total 60 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 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] | Fixed Maturity AFS Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 65 471
Greater Than Twelve Months 5 15
Fair Value - Total 70 486
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 2 9
Gross Unrealized Losses - Total 2 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 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
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 79 316
Greater Than Twelve Months   18
Fair Value - Total 79 334
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
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 101 29
Greater Than Twelve Months 85 102
Fair Value - Total 186 131
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