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Capital Stock - Additional Information (Detail) - USD ($)
$ / shares in Units, shares in Millions
 6 Months Ended 12 Months Ended
Jul. 29, 2015
Jun. 30, 2016
Dec. 31, 2015
Dec. 31, 2013
Class of Stock [Line Items]        
Cost of shares repurchased   $ 1,312,000,000 $ 3,622,000,000  
Common Class A        
Class of Stock [Line Items]        
Stock repurchase expiration date Dec. 31, 2018     Dec. 31, 2016
Stock repurchase value $ 13,700,000,000     $ 7,700,000,000
Increase in share repurchase value $ 6,000,000,000      
Number of shares repurchased   32.0    
Average cost of shares repurchased   $ 41.07    
Cost of shares repurchased   $ 1,300,000,000    
Stock repurchase remaining amount   $ 4,100,000,000