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Pension and Retiree Medical Benefits - Additional Information (Detail) (Discretionary, International, USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 23, 2013
Jun. 14, 2014
Discretionary | International
   
Defined Benefit Plan Disclosure [Line Items]    
Discretionary, pension contributions $ 13 $ 19