Stockholders Equity - Additional Information (Detail) (USD $)	12 Months Ended			1 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jan. 31, 2010 Share Repurchase Program, 2010	Dec. 31, 2013 Restricted Stock Units	Dec. 31, 2012 Restricted Stock Units
Stockholders Equity Note [Line Items]
Preferred stock, authorized shares	500,000,000	500,000,000
Preferred stock, par value (in usd per share)	$ 0.01	$ 0.01
Common shares outstanding plus shares underlying outstanding stock awards, including all stock-based awards outstanding, including estimated forfeiture	476,000,000	470,000,000	468,000,000
Repurchase program authorized by Board of Directors				$ 2,000,000,000
Repurchase program authorized, remaining common stock				763,000,000
Awards vesting period, minimum					2 years
Awards vesting period, maximum					5 years
Net unrecognized compensation cost related to unvested stock-based compensation arrangements	1,700,000,000
Net unrecognized compensation cost related to unvested stock-based compensation arrangements, weighted average recognition period (in years)	1 year 2 months 12 days
Fair value of vested restricted stock units					$ 1,400,000,000	$ 928,000,000
Shares of common stock granted under the 401 (k) savings plan	100,000	100,000
Common stock available for future issuance to employees	143,000,000