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Financial Instruments - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Estimated amount reclassified from other comprehensive income and reduce interest expense	$ 14

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- References

No definition available.

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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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