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Capital Stock - Additional Information (Detail) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 03, 2013
Common Class A
Aug. 06, 2013
Common Class A
Mar. 12, 2013
Common Class A
Dec. 31, 2013
Common Class A
Dec. 03, 2013
Common Class A
Accelerated Share Repurchases
Class of Stock [Line Items]                
Common stock, shares authorized 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          
Common stock reserved for stock option and other stock awards             91,300,000  
Stock repurchase in shares           40,000,000    
Stock repurchase value       $ 1,700,000,000 $ 6,000,000,000 $ 1,200,000,000 $ 7,700,000,000  
Stock repurchase expiration date         Dec. 31, 2016 Mar. 12, 2016    
Number of shares received under ASR agreement             82,799,448 44,800,000
Cost of shares repurchased 2,900,000,000           2,700,000,000 1,500,000,000
Average cost of shares repurchased             $ 33.09  
Stock repurchase remaining amount             5,000,000,000  
Payments for shares repurchased 2,900,000,000             1,700,000,000
Additional paid in capital treasury stock               $ 200,000,000