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Financial Instruments and Fair Value Measurements - Contractual Maturities of Debt Investments (Detail)
$ in Millions
Apr. 26, 2019
USD ($)
Investments Debt And Equity Securities [Abstract]  
Due in one year or less, Amortized Cost $ 591
Due after one year through five years, Amortized Cost 644
Due after five years through ten years, Amortized Cost 455
Total, Amortized Cost 1,690
Due in one year or less, Estimated Fair Value 589
Due after one year through five years, Estimated Fair Value 642
Due after five years through ten years, Estimated Fair Value 452
Total, Estimated Fair Value $ 1,683