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Statements of Cash Flows Additional Information - Supplemental Cash Flows and Non Cash Investing Activities (Detail) - USD ($)
$ in Millions
12 Months Ended
Apr. 29, 2016
Apr. 24, 2015
Apr. 25, 2014
Non-cash Investing Activities:      
Capital expenditures incurred but not paid $ 18 $ 12 $ 18
Acquisition of software through long-term financing 0 12 11
Supplemental Cash Flow Information:      
Income taxes paid, net of refunds 161 97 58
Interest paid $ 43 $ 33 $ 35