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Authorized Common Stock Repurchase Programs (Detail)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Class of Stock [Line Items]      
Common Stock, Shares Issued, Ending Balance 1,996,537,778 1,996,537,778  
Common Stock, Treasury Shares, Ending Balance (291,141,184) (218,541,936)  
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
Shares repurchased (82,799,448)    
Exercise of stock options and issuance of other stock awards         
Common Stock, Shares Issued, Ending Balance 1,996,537,778 1,996,537,778 1,996,537,778
Common Stock, Treasury Shares, Beginning Balance (218,541,936) (228,641,089) (248,471,229)
Exercise of stock options and issuance of other stock awards 10,200,200 10,099,153 19,830,140
Common Stock, Treasury Shares, Ending Balance (291,141,184) (218,541,936) (228,641,089)
Common Stock, Shares Outstanding, Beginning Balance 1,777,995,842 1,767,896,689 1,748,066,549
Shares repurchased (82,799,448)    
Exercise of stock options and issuance of other stock awards 10,200,200 10,099,153 19,830,140
Common Stock, Shares Outstanding, Ending Balance 1,705,396,594 1,777,995,842 1,767,896,689