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Financial Instruments and Fair Value Measurements - Contractual Maturities of Debt Investments (Detail)
$ in Millions
Apr. 30, 2021
USD ($)
Investments Debt And Equity Securities [Abstract]  
Due in one year or less, Amortized Cost $ 102
Due after one year through five years, Amortized Cost 20
Due after five years through ten years, Amortized Cost 5
Total, Amortized Cost 127
Due in one year or less, Estimated Fair Value 102
Due after one year through five years, Estimated Fair Value 21
Due after five years through ten years, Estimated Fair Value 5
Total, Estimated Fair Value $ 128