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Authorized Common Stock Repurchase Programs (Detail) - shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
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 (468,172,237)    
Common Stock, Treasury Shares, Ending Balance (508,401,694) (468,172,237)  
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 (468,172,237) (416,504,624) (332,896,779)
Shares repurchased (50,598,902) (61,972,713) (91,875,878)
Exercise of stock options and issuance of other stock awards 10,369,445 10,305,100 8,268,033
Common Stock, Treasury Shares, Ending Balance (508,401,694) (468,172,237) (416,504,624)
Common Stock, Shares Outstanding, Beginning Balance 1,528,365,541 1,580,033,154 1,663,640,999
Shares repurchased (50,598,902) (61,972,713) (91,875,878)
Exercise of stock options and issuance of other stock awards 10,369,445 10,305,100 8,268,033
Common Stock, Shares Outstanding, Ending Balance 1,488,136,084 1,528,365,541 1,580,033,154