Draws on Credit Facility that are Designated as Net Investments in Foreign Operations (Detail) € in Millions, CAD in Millions, AUD in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2016 EUR (€)	Dec. 31, 2016 AUD	Dec. 31, 2016 CAD
Debt Instrument Designated As Hedges Of Net Investment In Foreign Operations [Line Items]
Credit facility		$ 1,206	$ 1,291
Foreign currency translation and other comprehensive income (loss) of unconsolidated affiliates			(71)	$ (60)
Canadian Dollars
Debt Instrument Designated As Hedges Of Net Investment In Foreign Operations [Line Items]
Credit facility	[1]	34					CAD 46
Foreign currency translation and other comprehensive income (loss) of unconsolidated affiliates	[1]	(1)	5
Euros
Debt Instrument Designated As Hedges Of Net Investment In Foreign Operations [Line Items]
Credit facility		81			€ 77
Foreign currency translation and other comprehensive income (loss) of unconsolidated affiliates		3	$ 10
Australian Dollars
Debt Instrument Designated As Hedges Of Net Investment In Foreign Operations [Line Items]
Credit facility		36				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 that has not been designated as a hedging instrument.