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

X

- References

No definition available.

+ Details

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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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