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Investments (Fair Value And Gross Unrealized Losses In A Continuous Unrealized Loss Position) (Details)
$ in Millions
Sep. 30, 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 $ 36,894 $ 5,844
Greater Than Twelve Months 5,738 6,063
Fair Value - Total 42,632 11,907
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 1,287 89
Greater Than Twelve Months 663 374
Losses - Total $ 1,950 $ 463
Total number of AFS securities in an unrealized loss position | security 3,480 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 $ 33,196 4,854
Greater Than Twelve Months 4,690 4,893
Fair Value - Total 37,886 9,747
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 1,188 68
Greater Than Twelve Months 538 288
Losses - Total 1,726 356
Fixed Maturity AFS Securities [Member] | ABS [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 252 62
Greater Than Twelve Months 129 151
Fair Value - Total 381 213
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 3 1
Greater Than Twelve Months 12 15
Losses - Total 15 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 169 156
Greater Than Twelve Months 18 19
Fair Value - Total 187 175
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 4  
Greater Than Twelve Months 2 1
Losses - Total 6 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 836 302
Greater Than Twelve Months 603 641
Fair Value - Total 1,439 943
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 43 4
Greater Than Twelve Months 73 36
Losses - Total 116 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 624 113
Greater Than Twelve Months 57 60
Fair Value - Total 681 173
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 18  
Greater Than Twelve Months 5 3
Losses - Total 23 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 1,062 281
Greater Than Twelve Months 34 72
Fair Value - Total 1,096 353
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 14 2
Losses - Total 14 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 724 34
Greater Than Twelve Months 75 93
Fair Value - Total 799 127
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 15  
Greater Than Twelve Months 11 6
Losses - Total 26 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 31 20
Greater Than Twelve Months 132 126
Fair Value - Total 163 146
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 2  
Greater Than Twelve Months 22 22
Losses - Total $ 24 22
Equity 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