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FINANCIAL INSTRUMENTS (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 18 Months Ended
Jul. 31, 2016
May 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Jun. 30, 2015
Dec. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Mar. 15, 2015
Mar. 31, 2014
Jul. 24, 2012
Retired in Q1 2016 [Member]                      
Derivative [Line Items]                      
Face amount of debt       $ 200              
To be Retired in Q1 and Q2 2015 [Member]                      
Derivative [Line Items]                      
Face amount of debt         $ 1,300            
Cash Flow Hedging [Member]                      
Derivative [Line Items]                      
Accumulated net loss from designated or qualifying cash flow hedges           $ 10   $ 12      
Net amount of deferred gains and losses on cash flow hedges that is expected to be reclassified within the next 12 months           3          
Fair Value Hedging [Member]                      
Derivative [Line Items]                      
Derivative, notional amount           $ 1,200   $ 1,200      
Derivative asset designated as hedging instrument fair value on termination $ 60                    
Proceeds received from terminated interest rate swaps for accrued interest 6                    
Amount to be amortized as a reduction of interest expense $ 54                    
Fair Value Hedging [Member] | One-Month LIBOR [Member] | Minimum [Member]                      
Derivative [Line Items]                      
Interest rate           2.20%   1.40%      
Fair Value Hedging [Member] | One-Month LIBOR [Member] | Maximum [Member]                      
Derivative [Line Items]                      
Interest rate           3.00%   3.60%      
Treasury Lock [Member]                      
Derivative [Line Items]                      
Gain (loss) on derivatives   $ (1) $ 3                
Treasury Lock [Member] | Cash Flow Hedging [Member]                      
Derivative [Line Items]                      
Derivative, notional amount   $ 250 $ 350       $ 350        
Forward Starting Interest Rate Swaps [Member]                      
Derivative [Line Items]                      
Gain (loss) on derivatives             $ (17)        
Forward Starting Interest Rate Swaps [Member] | Cash Flow Hedging [Member]                      
Derivative [Line Items]                      
Derivative, notional amount                   $ 150  
Interest Rate Swaps [Member]                      
Derivative [Line Items]                      
Derivative asset designated as hedging instrument fair value on termination                     $ 72
Amount to be amortized as a reduction of interest expense           $ 71         $ 65
Reverse Treasury Locks [Member] | Economic Hedges [Member] | Not Designated as Hedging Instrument [Member]                      
Derivative [Line Items]                      
Derivative, notional amount       75         $ 280    
Reverse Treasury Locks [Member] | Economic Hedges [Member] | Not Designated as Hedging Instrument [Member] | Other Nonoperating Income (Expense) [Member]                      
Derivative [Line Items]                      
Derivative instruments not designated as hedging instruments, gain       $ 1 $ 3