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Investments (Fixed Maturity and Equity Securities Available-For-Sale by Sector) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Available-for-sale Securities [Abstract]      
Cost or Amortized Cost $ 330,354 $ 332,964  
Cost or Amortized Cost 2,744 2,997  
Gross Unrealized OTTI Loss (8) 76 $ 112
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $330,354 and $332,964, respectively; includes $3,422 and $4,277, respectively, relating to variable interest entities) 350,889 351,402  
Equity securities 3,194 3,321  
Fixed Maturity Securities      
Available-for-sale Securities [Abstract]      
Cost or Amortized Cost 330,354 332,964  
Gross Unrealized Gain 25,420 23,883  
Gross Unrealized Temporary Loss 4,893 5,369  
Gross Unrealized OTTI Loss (8) 76  
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $330,354 and $332,964, respectively; includes $3,422 and $4,277, respectively, relating to variable interest entities) 350,889 351,402  
U.S. corporate      
Available-for-sale Securities [Abstract]      
Cost or Amortized Cost 94,558 96,466  
Gross Unrealized Gain 7,351 6,583  
Gross Unrealized Temporary Loss 1,056 2,255  
Gross Unrealized OTTI Loss 0 0  
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $330,354 and $332,964, respectively; includes $3,422 and $4,277, respectively, relating to variable interest entities) 100,853 100,794  
Foreign corporate      
Available-for-sale Securities [Abstract]      
Cost or Amortized Cost 55,676 56,003  
Gross Unrealized Gain 3,132 3,019  
Gross Unrealized Temporary Loss 1,752 1,822  
Gross Unrealized OTTI Loss (1) 2  
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $330,354 and $332,964, respectively; includes $3,422 and $4,277, respectively, relating to variable interest entities) 57,057 57,198  
Foreign government      
Available-for-sale Securities [Abstract]      
Cost or Amortized Cost 50,923 45,451  
Gross Unrealized Gain 6,600 5,269  
Gross Unrealized Temporary Loss 385 221  
Gross Unrealized OTTI Loss 0 0  
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $330,354 and $332,964, respectively; includes $3,422 and $4,277, respectively, relating to variable interest entities) 57,138 50,499  
RMBS (1)      
Available-for-sale Securities [Abstract]      
Cost or Amortized Cost 36,293 37,914  
Gross Unrealized Gain 1,244 1,366  
Gross Unrealized Temporary Loss 554 424  
Gross Unrealized OTTI Loss (10) 59  
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $330,354 and $332,964, respectively; includes $3,422 and $4,277, respectively, relating to variable interest entities) 36,993 38,797  
U.S. government and agency      
Available-for-sale Securities [Abstract]      
Cost or Amortized Cost 53,326 56,499  
Gross Unrealized Gain 4,977 5,373  
Gross Unrealized Temporary Loss 780 226  
Gross Unrealized OTTI Loss 0 0  
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $330,354 and $332,964, respectively; includes $3,422 and $4,277, respectively, relating to variable interest entities) 57,523 61,646  
CMBS (1)      
Available-for-sale Securities [Abstract]      
Cost or Amortized Cost 11,092 12,410  
Gross Unrealized Gain 282 347  
Gross Unrealized Temporary Loss 103 125  
Gross Unrealized OTTI Loss (1) (1)  
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $330,354 and $332,964, respectively; includes $3,422 and $4,277, respectively, relating to variable interest entities) 11,272 12,633  
ABS      
Available-for-sale Securities [Abstract]      
Cost or Amortized Cost 13,920 14,498  
Gross Unrealized Gain 101 131  
Gross Unrealized Temporary Loss 141 229  
Gross Unrealized OTTI Loss 3 6  
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $330,354 and $332,964, respectively; includes $3,422 and $4,277, respectively, relating to variable interest entities) 13,877 14,394  
State and political subdivision      
Available-for-sale Securities [Abstract]      
Cost or Amortized Cost 14,566 13,723  
Gross Unrealized Gain 1,733 1,795  
Gross Unrealized Temporary Loss 122 67  
Gross Unrealized OTTI Loss 1 10  
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $330,354 and $332,964, respectively; includes $3,422 and $4,277, respectively, relating to variable interest entities) 16,176 15,441  
Equity securities      
Available-for-sale Securities [Abstract]      
Cost or Amortized Cost 2,744 2,997  
Gross Unrealized Gain 513 482  
Gross Unrealized Temporary Loss 63 158  
Gross Unrealized OTTI Loss 0 0  
Equity securities 3,194 3,321  
Common stock      
Available-for-sale Securities [Abstract]      
Cost or Amortized Cost 1,927 1,962  
Gross Unrealized Gain 488 397  
Gross Unrealized Temporary Loss 14 107  
Gross Unrealized OTTI Loss 0 0  
Equity securities 2,401 2,252  
Non-redeemable preferred stock      
Available-for-sale Securities [Abstract]      
Cost or Amortized Cost 817 1,035  
Gross Unrealized Gain 25 85  
Gross Unrealized Temporary Loss 49 51  
Gross Unrealized OTTI Loss 0 0  
Equity securities $ 793 $ 1,069