Fair Value Measurements - Narrative (Details) - Senior Notes - USD ($) $ in Millions	Jan. 31, 2021	Oct. 25, 2020
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Long-term debt, principal amount	$ 5,500	$ 5,500
Estimated fair value \| Level 2
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Long-term debt fair value	$ 6,600	$ 6,600

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Balance Type:	credit
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