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Capital Stock - Additional Information (Detail) - USD ($)
 1 Months Ended 6 Months Ended 12 Months Ended
Jul. 29, 2015
Dec. 31, 2013
May 31, 2014
May 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Class of Stock [Line Items]              
Common stock, shares authorized         5,000,000,000 5,000,000,000  
Preferred stock, shares authorized         500,000,000    
Preferred stock, shares issued         0 0 0
Preferred stock, shares outstanding         0 0 0
Cost of shares repurchased         $ 2,601,000,000 $ 3,622,000,000 $ 1,891,000,000
Payments for shares repurchased         $ 2,601,000,000 $ 3,622,000,000 $ 1,700,000,000
Common Class A              
Class of Stock [Line Items]              
Common stock reserved for stock option and other stock awards         134,000,000    
Stock repurchase expiration date         Dec. 31, 2016    
Stock repurchase value   $ 7,700,000,000          
Number of shares repurchased         61,972,713 91,875,878 51,931,864
Average cost of shares repurchased         $ 41.97 $ 39.43  
Cost of shares repurchased         $ 2,600,000,000 $ 3,600,000,000  
Stock repurchase remaining amount         2,800,000,000    
Additional paid in capital treasury stock   $ 200,000,000 $ 200,000,000        
Common Class A | Share Repurchase Program amended July 29, 2015              
Class of Stock [Line Items]              
Stock repurchase expiration date Dec. 31, 2018            
Stock repurchase value $ 13,700,000,000            
Increase in share repurchase value $ 6,000,000,000            
Common Class A | Accelerated Share Repurchase Program              
Class of Stock [Line Items]              
Number of shares repurchased   44,800,000 5,100,000 49,900,000      
Cost of shares repurchased   $ 1,500,000,000 $ 200,000,000        
Payments for shares repurchased   $ 1,700,000,000          
Common Class A | Accelerated Share Repurchase Program | Weighted Average              
Class of Stock [Line Items]              
Accelerated share repurchases, average repurchase price per share       $ 34.10      
Common Class A | Prior to January 1, 2016              
Class of Stock [Line Items]              
Stock repurchase value         $ 8,200,000,000