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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Notional Amounts Being Hedged and the Fair Value of those Derivative Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Foreign currency exchange contracts |  |
Derivative instruments and hedging activities |  |
Notional Amount |  | $ 14
Foreign currency exchange contracts | Accrued liabilities | Recurring | Fair Value, Inputs, Level 2 |  |
Derivative instruments and hedging activities |  |
Derivative Asset, Current |  | 0
Foreign currency forward contracts |  |
Derivative instruments and hedging activities |  |
Notional Amount | $ 74 | 43
Foreign currency forward contracts | Receivables | Recurring | Fair Value, Inputs, Level 2 |  |
Derivative instruments and hedging activities |  |
Derivative Asset, Current | 0 | 0
Foreign currency forward contracts | Accrued liabilities | Recurring | Fair Value, Inputs, Level 2 |  |
Derivative instruments and hedging activities |  |
Derivative Liability, Current | 0 |
Derivative Liability, Noncurrent |  | $ 0
Foreign currency forward contracts | Other Current Liabilities | Recurring | Fair Value, Inputs, Level 2 |  |
Derivative instruments and hedging activities |  |
Derivative Liability, Current | $ 0 |

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