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Stock Plans - Additional Information (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
6 Months Ended 12 Months Ended
Jul. 29, 2015
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Cost of shares repurchased   $ 2,166   $ 1,891  
Payment for repurchase of common stock   $ 2,132 $ 720    
Common Class A          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock repurchase value         $ 7,700
Stock repurchase expiration date   Dec. 31, 2016      
Number of shares repurchased   58.2      
Average cost of shares repurchased   $ 37.17      
Cost of shares repurchased   $ 2,200      
Payment for repurchase of common stock   2,100      
Stock repurchase remaining amount   $ 900      
Common Class A | Subsequent Event          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock repurchase value $ 13,700        
Stock repurchase expiration date Dec. 31, 2018        
Increase in share repurchase value $ 6,000