FINANCIAL INSTRUMENTS (Narrative) (Details) (USD $) In Millions, unless otherwise specified	18 Months Ended	1 Months Ended	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2015	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Mar. 15, 2015
Derivative [Line Items]
Debt instrument, face amount	$ 1,200	$ 1,200	$ 1,200
To be Retired in Q1 and Q2 2015 [Member]
Derivative [Line Items]
Debt instrument, face amount	1,300	1,300	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	14	14	14	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