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INVESTMENTS (TEXTUAL) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Jan. 03, 2017
Investments In Fixed Maturity Securities Other Disclosure [Abstract]            
Debt securities exposure in single issuer greater than stated percentage of total investments 0.30%   0.30%      
Available-for-sale securities, amortized cost basis $ 32,371   $ 32,371   $ 32,236  
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 62   62   105  
Carrying value of fixed maturities non-income producing 2   2      
Investment expenses 9 $ 14 29 $ 30    
Trading securities, Cost 10,961   10,961   9,177  
Trading securities, at fair value 10,969   10,969   9,134  
Separate account equity investment carrying value 48   48   63  
Separate account equity investment cost 30   30   46  
Derecognized US Treasury securities 869   869   995  
Proceeds from return swap contract         1,007  
Fair value of return swap contracts 18   18      
Other Than Investment Grade            
Investments In Fixed Maturity Securities Other Disclosure [Abstract]            
Available-for-sale securities, amortized cost $ 1,527   $ 1,527   $ 1,574  
Percentage of available for sale securities 4.70%   4.70%   4.90%  
Public corporate            
Investments In Fixed Maturity Securities Other Disclosure [Abstract]            
Debt securities exposure in single issuer of total investments $ 179   $ 179   $ 169  
Available-for-sale securities, amortized cost basis 12,530   12,530   12,418  
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 5   5   6  
Fixed Maturities            
Investments In Fixed Maturity Securities Other Disclosure [Abstract]            
Available-for-sale securities, amortized cost basis $ 32,239   32,239   32,123  
Fixed Maturities | Other Than Investment Grade            
Investments In Fixed Maturity Securities Other Disclosure [Abstract]            
Gross Unrealized Losses     20   28  
Treasury Lock            
Investments In Fixed Maturity Securities Other Disclosure [Abstract]            
Unrealized gain (loss) TIPS     $ 31   $ 97  
Change in Accounting Method Accounted for as Change in Estimate [Member]            
Investments In Fixed Maturity Securities Other Disclosure [Abstract]            
Gross derivative assets           $ 57
Gross derivative liabilities           $ 0