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Financial Instruments and Fair Value Measurements - Contractual Maturities of Debt Investments (Detail)
$ in Millions
Jan. 24, 2020
USD ($)
Investments Debt And Equity Securities [Abstract]  
Due in one year or less, Amortized Cost $ 368
Due after one year through five years, Amortized Cost 88
Due after five years through ten years, Amortized Cost 5
Total, Amortized Cost 461
Due in one year or less, Estimated Fair Value 368
Due after one year through five years, Estimated Fair Value 89
Due after five years through ten years, Estimated Fair Value 5
Total, Estimated Fair Value $ 462