Charges and Credits - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($) VEF / $
Charges And Credits [Line Items]
Restructuring and other charges	$ 0	$ 439
Exchange rate | VEF / $		192
Foreign currency transactions, description	This change resulted in a reduction in the US dollar reported amount of local currency denominated revenues, expenses and, consequently, income before taxes and net income in Venezuela.
Workforce reduction
Charges And Credits [Line Items]
Restructuring and other charges		$ 390
Currency Devaluation Loss In Venezuela
Charges And Credits [Line Items]
Restructuring and other charges		$ 49