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FINANCIAL INSTRUMENTS (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 18 Months Ended
Jul. 31, 2016
May 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Jun. 30, 2015
Sep. 30, 2016
Mar. 31, 2015
Dec. 31, 2015
Mar. 31, 2014
Retired in Q1 2016 [Member]                  
Derivative [Line Items]                  
Debt instrument, face amount       $ 200          
Retired in Q1 and Q2 2015 [Member]                  
Derivative [Line Items]                  
Debt instrument, face amount         $ 1,300        
Treasury Lock [Member]                  
Derivative [Line Items]                  
Gain (loss) on derivatives   $ (1) $ 3            
Forward Starting Interest Rate Swaps [Member]                  
Derivative [Line Items]                  
Gain (loss) on derivatives             $ (17)    
Cash Flow Hedging [Member]                  
Derivative [Line Items]                  
Accumulated net loss from designated or qualifying cash flow hedges           $ 11   $ 12  
Net amount of deferred gains and losses on cash flow hedges that is expected to be reclassified within the next 12 months           3      
Cash Flow Hedging [Member] | Treasury Lock [Member]                  
Derivative [Line Items]                  
Notional amount of interest rate derivatives   $ 250 $ 350       $ 350    
Cash Flow Hedging [Member] | Forward Starting Interest Rate Swaps [Member]                  
Derivative [Line Items]                  
Notional amount of interest rate derivatives                 $ 150
Fair Value Hedging [Member]                  
Derivative [Line Items]                  
Notional amount of interest rate derivatives           $ 1,200   $ 1,200  
Derivative asset designated as hedging Instrument fair value on termination $ 60                
Deferred gain (loss) on discontinuation of interest rate fair value hedge 54                
Proceeds received from terminated interest rate swaps for accrued interest $ 6                
Fair Value Hedging [Member] | One-Month LIBOR [Member] | Minimum [Member]                  
Derivative [Line Items]                  
Floating rate               1.40%  
Fair Value Hedging [Member] | One-Month LIBOR [Member] | Maximum [Member]                  
Derivative [Line Items]                  
Floating rate               3.60%  
Economic Hedges [Member] | Reverse Treasury Locks [Member] | Not Designated as Hedging Instrument [Member]                  
Derivative [Line Items]                  
Notional amount of interest rate derivatives       75 280        
Economic Hedges [Member] | Reverse Treasury Locks [Member] | Not Designated as Hedging Instrument [Member] | Other Nonoperating Income (Expense) [Member]                  
Derivative [Line Items]                  
Gain on derivative       $ 1 $ 3