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INVESTMENTS (TEXTUAL) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
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 $ 32,274   $ 32,274   $ 32,236
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 402   402   105
Carrying value of fixed maturities non-income producing 1   1    
Investment expenses 31 $ 16 40 $ 47  
Trading securities, at fair value 12,053   12,053   9,134
Separate account equity investment carrying value 49   49   63
Separate account equity investment cost 31   31   46
Derecognized US Treasury securities 2,090   2,090   2,220
Proceeds from return swap contract         2,126
Fair value of return swap contracts (8)   (8)    
Other Than Investment Grade          
Investments In Fixed Maturity Securities Other Disclosure [Abstract]          
Available-for-sale securities, amortized cost $ 1,523   $ 1,523   $ 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 $ 178   $ 178   $ 169
Available-for-sale securities, amortized cost basis 12,429   12,429   12,418
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 24   24   6
Fixed Maturities          
Investments In Fixed Maturity Securities Other Disclosure [Abstract]          
Available-for-sale securities, amortized cost basis $ 32,139   32,139   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     $ 97   $ 97