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Financial Instruments and Fair Value Measurements - Contractual Maturities of Debt Investments (Detail)
$ in Millions
Jul. 31, 2020
USD ($)
Investments Debt And Equity Securities [Abstract]  
Due in one year or less, Amortized Cost $ 194
Due after one year through five years, Amortized Cost 54
Due after five years through ten years, Amortized Cost 5
Total, Amortized Cost 253
Due in one year or less, Estimated Fair Value 195
Due after one year through five years, Estimated Fair Value 56
Due after five years through ten years, Estimated Fair Value 5
Total, Estimated Fair Value $ 256