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Statements of Cash Flows Additional Information - Supplemental Cash Flows and Non Cash Investing Activities (Detail) - USD ($)
$ in Millions
3 Months Ended
Jul. 29, 2016
Jul. 31, 2015
Non-cash Investing Activities:    
Capital expenditures incurred but not paid $ 38 $ 13
Supplemental Cash Flow Information:    
Income taxes paid, net of refunds 62 40
Interest paid $ 23 $ 20