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		9 Months Ended
		Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 AUD	Sep. 30, 2016 EUR (€)	Sep. 30, 2016 CAD	Dec. 31, 2015 USD ($)
Debt Instrument Designated As Hedges Of Net Investment In Foreign Operations [Line Items]
Credit facility		$ 1,306		$ 1,306					$ 1,291
Foreign currency translation and other comprehensive income (loss) of unconsolidated affiliates		(1)	$ (27)	13	$ (71)
Canadian Dollars
Debt Instrument Designated As Hedges Of Net Investment In Foreign Operations [Line Items]
Credit facility	[1]	35		35				CAD 46
Foreign currency translation and other comprehensive income (loss) of unconsolidated affiliates	[1]		$ 3	(2)	4
Euros
Debt Instrument Designated As Hedges Of Net Investment In Foreign Operations [Line Items]
Credit facility		87		87			€ 77
Foreign currency translation and other comprehensive income (loss) of unconsolidated affiliates		(1)		(3)	$ 7
Australian Dollars
Debt Instrument Designated As Hedges Of Net Investment In Foreign Operations [Line Items]
Credit facility		38		$ 38		AUD 50
Foreign currency translation and other comprehensive income (loss) of unconsolidated affiliates		$ (1)

[1] We have drawn an additional $46 million on the credit facility in Canadian dollars, which draw has not been designated as a hedging instrument.