FINANCIAL INSTRUMENTS (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	6 Months Ended	9 Months Ended	18 Months Ended
	Mar. 31, 2015	Jun. 30, 2015	Sep. 30, 2015	Mar. 31, 2015	Mar. 15, 2015	Dec. 31, 2014	Mar. 31, 2014
To be Retired in Q1 and Q2 2015 [Member]
Derivative [Line Items]
Debt instrument, face amount		$ 1,300
Forward Starting Interest Rate Swaps [Member]
Derivative [Line Items]
Gain (loss) on derivatives				$ (17)
Treasury Lock [Member]
Derivative [Line Items]
Gain (loss) on derivatives	$ 3
Cash Flow Hedging [Member]
Derivative [Line Items]
Notional amount of interest rate derivatives							$ 150
Accumulated net loss from designated or qualifying cash flow hedges			$ 12			$ 15
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					$ 350
Economic Hedges [Member] | Reverse Treasury Locks [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amount of interest rate derivatives					$ 280
Economic Hedges [Member] | Reverse Treasury Locks [Member] | Not Designated as Hedging Instrument [Member] | Other Operating (Income) Expense [Member]
Derivative [Line Items]
Gain on derivative		$ 3