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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 |  |  |  |

X
- Definition Total gain or loss, net of tax expense or benefit recognized in accumulated other comprehensive income (loss) resulting from gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. A cash flow hedge is a hedge of the exposure to variability in the cash flows of a recognized asset or liability or a forecasted transaction that is attributable to a particular risk. + References No definition available. + Details
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