Derivative Financial Instruments - Additional Information (Detail) (Foreign currency derivative, USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative [Line Items]
Foreign currency derivative contract, notional amount	$ 1,800,000,000	$ 3,400,000,000
Net Investment Hedging
Derivative [Line Items]
Forward contracts minimum maturity Period	9 months
Forward contracts maximum maturity Period	15 months
Foreign currency derivative contract, notional amount	1,300,000,000	3,000,000,000
Fair value of the foreign currency forward contract asset	209,000,000	3,000,000
Gain (loss) on foreign currency forward contract	510,000,000	3,000,000
Cash received (paid) to settle foreign currency forward contracts	304,000,000
Cash Flow Hedges
Derivative [Line Items]
Foreign currency derivative contract, notional amount	56,000,000
Fair value of the foreign currency forward contract asset	4,000,000
Cash received (paid) to settle foreign currency forward contracts	2,000,000
Foreign currency forward contracts designated as cash flow hedges maturities	Jul. 31, 2014
Gain on foreign currency forward contracts	2,000,000
Gain (loss) on foreign currency forward contract	2,000,000
Balance Sheet Hedges
Derivative [Line Items]
Foreign currency derivative contract, notional amount	393,000,000	356,000,000
Cash received (paid) to settle foreign currency forward contracts	(17,000,000)	7,000,000
Fair value of the foreign currency forward contract liability		5,000,000
Gain (loss) on foreign currency forward contract	(12,000,000)	4,000,000	(3,000,000)
Balance Sheet Hedges | Maximum
Derivative [Line Items]
Fair value of the foreign currency forward contract liability	$ 1,000,000