Fair Value Option - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fair Value Disclosures [Abstract]
Increased the debt balance	$ 245	$ 247
Foreign currency translation gains (losses) recorded in derivatives	(73)	(35)	63
Offsetting gains (losses) recorded in derivative related income (expense)	73	35	(63)
Cumulative increased value of debt through fair value option adjustments	$ 581	$ 824