Financial Instruments and Fair Value Measurements - Contractual Maturities of Debt Investments (Detail) $ in Millions	Oct. 26, 2018 USD ($)
Investments Debt And Equity Securities [Abstract]
Due in one year or less, Amortized Cost	$ 679
Due after one year through five years, Amortized Cost	835
Due after five years through ten years, Amortized Cost	578
Total, Amortized Cost	2,092
Due in one year or less, Estimated Fair Value	676
Due after one year through five years, Estimated Fair Value	821
Due after five years through ten years, Estimated Fair Value	551
Total, Estimated Fair Value	$ 2,048