FINANCIAL INSTRUMENTS (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended	6 Months Ended		18 Months Ended
	May 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Jun. 30, 2016	Jun. 30, 2015	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
Forward Starting Interest Rate Swaps [Member]
Derivative [Line Items]
Gain (loss) on derivatives						$ (17)
Treasury Lock [Member]
Derivative [Line Items]
Gain (loss) on derivatives	$ (1)	$ 3
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] | Forward Starting Interest Rate Swaps [Member]
Derivative [Line Items]
Notional amount of interest rate derivatives								$ 150
Cash Flow Hedging [Member] | Treasury Lock [Member]
Derivative [Line Items]
Notional amount of interest rate derivatives	$ 250	$ 350				$ 350
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