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Investments (Fair Value And Gross Unrealized Losses In A Continuous Unrealized Loss Position) (Details)
$ in Millions
Dec. 31, 2018
USD ($)
security
Dec. 31, 2017
USD ($)
security
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months $ 35,246 $ 5,844
Greater Than Twelve Months 8,671 6,063
Fair Value - Total 43,917 11,907
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 1,589 89
Greater Than Twelve Months 856 374
Losses - Total $ 2,445 $ 463
Total number of AFS securities in an unrealized loss position | security 3,414 1,128
Fixed Maturity AFS Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months   $ 5,822
Greater Than Twelve Months   6,055
Fair Value - Total   11,877
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months   75
Greater Than Twelve Months   371
Losses - Total   446
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 $ 32,493 4,854
Greater Than Twelve Months 7,228 4,893
Fair Value - Total 39,721 9,747
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 1,530 68
Greater Than Twelve Months 735 288
Losses - Total 2,265 356
Fixed Maturity AFS Securities [Member] | ABS [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 117 62
Greater Than Twelve Months 143 151
Fair Value - Total 260 213
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 2 1
Greater Than Twelve Months 14 15
Losses - Total 16 16
Fixed Maturity AFS Securities [Member] | U.S. Government Bonds [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 70 156
Greater Than Twelve Months 23 19
Fair Value - Total 93 175
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 1  
Greater Than Twelve Months 1 1
Losses - Total 2 1
Fixed Maturity AFS Securities [Member] | RMBS [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 472 302
Greater Than Twelve Months 863 641
Fair Value - Total 1,335 943
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 10 4
Greater Than Twelve Months 60 36
Losses - Total 70 40
Fixed Maturity AFS Securities [Member] | CMBS [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 470 113
Greater Than Twelve Months 82 60
Fair Value - Total 552 173
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 11  
Greater Than Twelve Months 5 3
Losses - Total 16 3
Fixed Maturity AFS Securities [Member] | CLOs [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 1,124 281
Greater Than Twelve Months 103 72
Fair Value - Total 1,227 353
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 21 2
Greater Than Twelve Months 3  
Losses - Total 24 2
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 404 34
Greater Than Twelve Months 96 93
Fair Value - Total 500 127
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 8  
Greater Than Twelve Months 10 6
Losses - Total 18 6
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 96 20
Greater Than Twelve Months 133 126
Fair Value - Total 229 146
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 6  
Greater Than Twelve Months 28 22
Losses - Total $ 34 22
Equity AFS Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months   22
Greater Than Twelve Months   8
Fair Value - Total   30
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months   14
Greater Than Twelve Months   3
Losses - Total   $ 17