Derivative Financial Instruments - Location of the Company's Derivative Instruments Recorded at Fair Value on the Consolidated Balance Sheets (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities held for sale	$ 10	$ 3
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets held for sale	4	5
Designated as Hedging Instruments [Member] | Assets Held for Sale [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities held for sale	2
Designated as Hedging Instruments [Member] | Assets Held for Sale [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets held for sale	$ 2