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FINANCIAL INSTRUMENTS (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 18 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2016 | May 31, 2016 | Mar. 31, 2015 | Mar. 31, 2016 | Jun. 30, 2015 | Dec. 31, 2017 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Mar. 15, 2015 | Mar. 31, 2014 | Jul. 24, 2012
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accumulated net loss from designated or qualifying cash flow hedges |  |  |  |  |  | $ (48) |  | $ (72) |  |  |  |
Retired in Q1 2016 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  | $ 200 |  |  |  |  |  |  |  |
To be Retired in Q1 and Q2 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  | $ 1,300 |  |  |  |  |  |  |
Cash Flow Hedging [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accumulated net loss from designated or qualifying cash flow hedges |  |  |  |  |  | 9 |  | 10 |  |  |  |
Net amount of deferred gains and losses on cash flow hedges that is expected to be reclassified within the next 12 months |  |  |  |  |  | 3 |  |  |  |  |  |
Fair Value Hedging [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  | $ 1,200 |  | $ 1,200 | $ 1,200 |  |  |
Derivative asset designated as hedging instrument fair value on termination | $ 60 |  |  |  |  |  |  |  |  |  |  |
Proceeds received from terminated interest rate swaps for accrued interest | 6 |  |  |  |  |  |  |  |  |  |  |
Amount to be amortized as a reduction of interest expense | $ 54 |  |  |  |  |  |  |  |  |  |  |
Fair Value Hedging [Member] | One-Month LIBOR [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 2.20% |  |  |  |  |  |
Fair Value Hedging [Member] | One-Month LIBOR [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 3.00% |  |  |  |  |  |
Treasury Lock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on derivatives |  | $ (1) | $ 3 |  |  |  |  |  |  |  |  |
Treasury Lock [Member] | Cash Flow Hedging [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  | $ 250 | $ 350 |  |  |  | $ 350 |  |  |  |  |
Forward Starting Interest Rate Swaps [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on derivatives |  |  |  |  |  |  | $ (17) |  |  |  |  |
Forward Starting Interest Rate Swaps [Member] | Cash Flow Hedging [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  |  |  |  |  |  | $ 150 |
Interest Rate Swaps [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative asset designated as hedging instrument fair value on termination |  |  |  |  |  |  |  |  |  |  |  | $ 72
Amount to be amortized as a reduction of interest expense |  |  |  |  |  |  |  |  |  |  |  | $ 65
Reverse Treasury Locks [Member] | Economic Hedges [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  | 75 |  |  |  |  |  | $ 280 |  |
Reverse Treasury Locks [Member] | Economic Hedges [Member] | Not Designated as Hedging Instrument [Member] | Other Nonoperating Income (Expense) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative instruments not designated as hedging instruments, gain |  |  |  | $ 1 | $ 3 |  |  |  |  |  |  |

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