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FINANCIAL INSTRUMENTS (Summary of Notional Amounts) (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | May 31, 2016 | Dec. 31, 2015 | Mar. 31, 2015
4.25% Senior Notes due April 2024 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Debt instrument, interest rate | 4.25% |  |  |  |
Debt instrument, maturity date | Apr. 01, 2024 |  |  |  |
3.50% Senior Notes due March 2025 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Debt instrument, interest rate | 3.50% |  |  |  | 3.50%
Debt instrument, maturity date | Mar. 30, 2025 |  |  |  |
3.45% Senior Notes due June 2026 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Debt instrument, interest rate | 3.45% |  | 3.45% |  |
Debt instrument, maturity date | Jun. 30, 2026 |  |  |  |
Fair Value Hedging [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | $ 1,200 | $ 1,200 |  | $ 1,200 |
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% |  |  |  |
Fair Value Hedging [Member] | 4.25% Senior Notes due April 2024 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | $ 250 | 250 |  |  |
Fair Value Hedging [Member] | 3.50% Senior Notes due March 2025 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | 600 | 600 |  |  |
Fair Value Hedging [Member] | 3.45% Senior Notes due June 2026 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | $ 350 | $ 350 |  |  |

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