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Derivative Instruments and Hedging Activities - Schedule of Foreign Exchange Contracts (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Derivative
Net contract notional amount of foreign exchange forward contracts	$ 23	$ 16
Foreign Exchange Contract
Derivative
Contract notional amount of foreign exchange forward contracts	$ 147	$ 156

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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X

- Definition

Notional Amount Of Foreign Currency Fair Value Hedge Derivatives Net Basis

+ References

No definition available.

+ Details

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X

- 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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- Details

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