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Earnings Per Share - Additional Information (Detail) - Nonvested Stock Options and Shares - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 24, 2016
Sep. 26, 2015
Sep. 24, 2016
Sep. 26, 2015
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Shares excluded from computation of diluted earnings per share 6   7  
Maximum        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Shares excluded from computation of diluted earnings per share   3   1