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Statements of Cash Flows Additional Information - Supplemental Cash Flows, Non-Cash Investing Activities (Detail) - USD ($)
$ in Millions
3 Months Ended
Jul. 27, 2018
Jul. 28, 2017
Non-cash Investing Activities:    
Capital expenditures incurred but not paid $ 10 $ 18
Supplemental Cash Flow Information:    
Income taxes paid, net of refunds 22 22
Interest paid $ 14 $ 21