Derivatives And Hedging Activities - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Commodity Contracts [Member]
Derivative [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	$ 1	$ 2
Cost of Sales [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Commodity Contracts [Member]
Derivative [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	1	$ 1
Designated as Hedging Instrument [Member] | Other Current Liabilities [Member] | Commodity [Member]
Derivative [Line Items]
Fair Value, Net Asset (Liability)	$ 2		$ 3