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Supplemental Financial Information - Supplemental Cash Flows, Non-Cash Investing and Financing Activities (Detail) - USD ($)
$ in Millions
6 Months Ended
Oct. 26, 2018
Oct. 27, 2017
Non-cash Investing and Financing Activities:    
Capital expenditures incurred but not paid $ 7 $ 17
Supplemental Cash Flow Information:    
Income taxes paid, net of refunds 104 28
Interest paid $ 26 $ 24