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FAIR VALUE OF FINANCIAL INSTRUMENTS (Debt Narrative) (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Estimated Fair Value |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Percentage Bearing Fixed Interest, Amount | $ 822 | $ 961
Carrying Value |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Percentage Bearing Fixed Interest, Amount | $ 799 | $ 949

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate. + References No definition available. + Details
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