Stockholders Equity - Additional Information (Detail) (USD $) Share data in Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Share Repurchase Program, 2010	Jan. 31, 2010 Share Repurchase Program, 2010
Stockholders Equity Note [Line Items]
Repurchase program authorized by Board of Directors				$ 2,000,000,000
Repurchase program authorized, remaining common stock			763,000,000
Common shares outstanding plus shares underlying outstanding stock awards, including all stock-based awards outstanding, including estimated forfeiture	480	476
Net unrecognized compensation cost related to unvested stock-based compensation arrangements	$ 2,200,000,000
Net unrecognized compensation cost related to unvested stock-based compensation arrangements, weighted average recognition period (in years)	1 year 2 months 12 days