Financial Instruments and Fair Value Measurements - Contractual Maturities of Debt Investments (Detail) $ in Millions	Oct. 27, 2017 USD ($)
Investments Debt And Equity Securities [Abstract]
Due in one year or less, Amortized Cost	$ 1,242
Due after one year through five years, Amortized Cost	1,187
Due after five years through ten years, Amortized Cost	419
Due after ten years, Amortized Cost	5
Total, Amortized Cost	2,853
Due in one year or less, Estimated Fair Value	1,242
Due after one year through five years, Estimated Fair Value	1,186
Due after five years through ten years, Estimated Fair Value	421
Due after ten years, Estimated Fair Value	5
Total, Estimated Fair Value	$ 2,854