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Stockholders Equity - Additional Information (Detail) (USD $)
Share data in Millions, unless otherwise specified
3 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Jan. 31, 2010
Share Repurchase Program, 2010
Mar. 31, 2014
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 476 476    
Net unrecognized compensation cost related to unvested stock-based compensation arrangements $ 1,600,000,000      
Net unrecognized compensation cost related to unvested stock-based compensation arrangements, weighted average recognition period (in years) 1 year 1 month 24 days