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Derivative Instruments and Hedging Activities - Summary of Classification and Fair Values of Derivative Instruments (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Designated as Hedging Instrument [Member] | Swap [Member] | Accounts Payable [Member] | Cash Flow Hedge [Member]
Derivative [Line Items]
Asset derivatives	$ 42	$ 25
Designated as Hedging Instrument [Member] | Swap [Member] | Other Current Liabilities [Member] | Fair Value Hedge [Member]
Derivative [Line Items]
Liability derivatives	(24)	(2)
Designated as Hedging Instrument [Member] | Liabilities Derivatives - Interest Rate and Cross Currency Swaps [Member] | Accounts Payable [Member]
Derivative [Line Items]
Liability derivatives	(58)	(96)
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Other Non-current Assets [Member]
Derivative [Line Items]
Asset derivatives	23	17
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Accounts Payable [Member]
Derivative [Line Items]
Liability derivatives	$ (14)	$ (15)

X

- Definition

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

+ References

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- Definition

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+ References

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