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Financial Instruments - Additional Information (Detail) $ in Millions | 9 Months Ended
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Sep. 30, 2017 USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Estimated amount reclassified from other comprehensive income to interest expense | $ 3

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- Definition The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings. + References No definition available. + Details
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