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
		Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2017 EUR (€)	Mar. 31, 2017 CAD	Mar. 31, 2017 AUD	Dec. 31, 2016 USD ($)
Debt Instrument Designated As Hedges Of Net Investment In Foreign Operations [Line Items]
Credit facility		$ 1,211					$ 1,206
Foreign currency translation and other comprehensive income (loss) of unconsolidated affiliates		7	$ 14
Canadian Dollars
Debt Instrument Designated As Hedges Of Net Investment In Foreign Operations [Line Items]
Credit facility	[1]	35			CAD 46
Foreign currency translation and other comprehensive income (loss) of unconsolidated affiliates	[1]		2
Euros
Debt Instrument Designated As Hedges Of Net Investment In Foreign Operations [Line Items]
Credit facility		82		€ 77
Foreign currency translation and other comprehensive income (loss) of unconsolidated affiliates		(1)	$ 4
Australian Dollars
Debt Instrument Designated As Hedges Of Net Investment In Foreign Operations [Line Items]
Credit facility		38				AUD 50
Foreign currency translation and other comprehensive income (loss) of unconsolidated affiliates		$ (2)

[1] We have drawn an additional $45 million on the credit facility in Canadian dollars, which has not been designated as a hedging instrument.