Draws on Credit Facility that are Designated as Net Investments in Foreign Operations (Detail) € in Millions, CAD in Millions, AUD in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 EUR (€)	Jun. 30, 2016 AUD	Jun. 30, 2016 CAD	Dec. 31, 2015 USD ($)
Debt Instrument Designated As Hedges Of Net Investment In Foreign Operations [Line Items]
Credit facility		$ 1,255		$ 1,255					$ 1,291
Foreign currency translation and other comprehensive income (loss) of unconsolidated affiliates			$ 3	14	$ (44)
Canadian Dollars
Debt Instrument Designated As Hedges Of Net Investment In Foreign Operations [Line Items]
Credit facility	[1]	36		36				CAD 46
Foreign currency translation and other comprehensive income (loss) of unconsolidated affiliates	[1]		(1)	(2)	1
Euros
Debt Instrument Designated As Hedges Of Net Investment In Foreign Operations [Line Items]
Credit facility		86		86		€ 77
Foreign currency translation and other comprehensive income (loss) of unconsolidated affiliates		2	$ (3)	(2)	$ 7
Australian Dollars
Debt Instrument Designated As Hedges Of Net Investment In Foreign Operations [Line Items]
Credit facility		37		37			AUD 50
Foreign currency translation and other comprehensive income (loss) of unconsolidated affiliates		$ 1		$ 1

[1] We have drawn an additional $47 million on the credit facility in Canadian dollars, which draw has not been designated as a hedging instrument.