Derivative Instruments and Hedging Activities - Summary of Classification and Fair Values of Derivative Instruments (Detail) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Designated as Hedging Instrument [Member] | Swap [Member] | Accounts Payable [Member] | Cash Flow Hedge [Member]
Derivative [Line Items]
Asset derivatives	$ 37	$ 25
Designated as Hedging Instrument [Member] | Swap [Member] | Other Current Liabilities [Member] | Fair Value Hedge [Member]
Derivative [Line Items]
Liability derivatives	(16)	(2)
Designated as Hedging Instrument [Member] | Liabilities Derivatives - Interest Rate and Cross Currency Swaps [Member] | Accounts Payable [Member]
Derivative [Line Items]
Liability derivatives	(64)	(96)
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Other Non-current Assets [Member]
Derivative [Line Items]
Asset derivatives	19	17
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Accounts Payable [Member]
Derivative [Line Items]
Liability derivatives	$ (17)	$ (15)