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Summary of Cash Flows Associated With Issuance and Maturities of Commercial Paper (Detail) - USD ($)
$ in Millions
12 Months Ended
Sep. 26, 2015
Sep. 27, 2014
Sep. 28, 2013
Maturities less than 90 days:      
Proceeds from (repayments of) commercial paper, net $ 5,293 $ 1,865  
Maturities greater than 90 days:      
Proceeds from commercial paper 3,851 4,771  
Repayments of commercial paper (6,953) (330)  
Maturities greater than 90 days, net (3,102) 4,441  
Total change in commercial paper, net $ 2,191 $ 6,306 $ 0