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INVESTMENTS (TEXTUAL) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 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%      
Available-for-sale securities, amortized cost basis $ 32,645   $ 32,236  
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 84   105  
Carrying value of fixed maturities non-income producing 4      
Investment expenses 19 $ 16    
Trading securities, Cost 10,303   9,177  
Trading securities, at fair value 10,291   9,134  
Separate account equity investment carrying value 63   63  
Separate account equity investment cost 47   46  
Derecognized US Treasury securities 852   995  
Proceeds from return swap contract     1,007  
Fair value of return swap contracts 102      
Other Than Investment Grade        
Investments In Fixed Maturity Securities Other Disclosure [Abstract]        
Available-for-sale securities, amortized cost $ 1,584   $ 1,574  
Percentage of available for sale securities 4.90%   4.90%  
Public corporate        
Investments In Fixed Maturity Securities Other Disclosure [Abstract]        
Debt securities exposure in single issuer of total investments $ 172   $ 169  
Available-for-sale securities, amortized cost basis 12,699   12,418  
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 6   6  
Fixed Maturities        
Investments In Fixed Maturity Securities Other Disclosure [Abstract]        
Available-for-sale securities, amortized cost basis 32,471   32,123  
Fixed Maturities | Other Than Investment Grade        
Investments In Fixed Maturity Securities Other Disclosure [Abstract]        
Gross Unrealized Losses 10   $ 28  
Treasury Lock        
Investments In Fixed Maturity Securities Other Disclosure [Abstract]        
Unrealized gain (loss) TIPS $ 94 $ 97    
Change in Accounting Method Accounted for as Change in Estimate [Member]        
Investments In Fixed Maturity Securities Other Disclosure [Abstract]        
Gross derivative assets       $ 82
Gross derivative liabilities       $ 8