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Financial Instruments and Fair Value Measurements - Contractual Maturities of Debt Investments (Detail)
$ in Millions
Jul. 28, 2017
USD ($)
Investments Debt And Equity Securities [Abstract]  
Due in one year or less, Amortized Cost $ 1,227
Due after one year through five years, Amortized Cost 1,157
Due after five years through ten years, Amortized Cost 297
Due after ten years, Amortized Cost 5
Total, Amortized Cost 2,686
Due in one year or less, Estimated Fair Value 1,226
Due after one year through five years, Estimated Fair Value 1,159
Due after five years through ten years, Estimated Fair Value 301
Due after ten years, Estimated Fair Value 5
Total, Estimated Fair Value $ 2,691