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Authorized Common Stock Repurchase Programs (Detail) - shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Class of Stock [Line Items]      
Common Stock, Shares Issued, Beginning Balance 1,996,537,778    
Common Stock, Shares Issued, Ending Balance 1,996,537,778 1,996,537,778  
Common Stock, Treasury Shares, Beginning Balance (332,896,779)    
Common Stock, Treasury Shares, Ending Balance (416,504,624) (332,896,779)  
Common Class A      
Class of Stock [Line Items]      
Common Stock, Shares Issued, Beginning Balance 1,996,537,778 1,996,537,778 1,996,537,778
Exercise of stock options and issuance of other stock awards 0 0 0
Common Stock, Shares Issued, Ending Balance 1,996,537,778 1,996,537,778 1,996,537,778
Common Stock, Treasury Shares, Beginning Balance (332,896,779) (291,141,184) (218,541,936)
Shares repurchased (91,875,878) (51,931,864) (82,799,448)
Exercise of stock options and issuance of other stock awards 8,268,033 10,176,269 10,200,200
Common Stock, Treasury Shares, Ending Balance (416,504,624) (332,896,779) (291,141,184)
Common Stock, Shares Outstanding, Beginning Balance 1,663,640,999 1,705,396,594 1,777,995,842
Shares repurchased (91,875,878) (51,931,864) (82,799,448)
Exercise of stock options and issuance of other stock awards 8,268,033 10,176,269 10,200,200
Common Stock, Shares Outstanding, Ending Balance 1,580,033,154 1,663,640,999 1,705,396,594