Debt - Summary of senior unsecured debt (Details) - USD ($) $ in Millions	Jul. 31, 2022	Jul. 31, 2021
Debt Instrument [Line Items]
Total senior unsecured notes	$ 6,930	$ 2,048
Unamortized discount and debt issuance costs	(16)	(14)
Total future principal payments for long-term debt	6,914	2,034
Short-term debt	499	0
Long-term debt	6,415	2,034
Term Loan
Debt Instrument [Line Items]
Total senior unsecured notes	4,700	0
Senior Unsecured Notes \| 0.650% Notes Due July 2023
Debt Instrument [Line Items]
Total senior unsecured notes	$ 500	500
Stated interest rate (in percent)	0.65%
Effective interest rate (in percent)	0.837%
Senior Unsecured Notes \| 0.950% Notes Due July 2025
Debt Instrument [Line Items]
Total senior unsecured notes	$ 500	500
Stated interest rate (in percent)	0.95%
Effective interest rate (in percent)	1.127%
Senior Unsecured Notes \| 1.350% notes due July 2027
Debt Instrument [Line Items]
Total senior unsecured notes	$ 500	500
Stated interest rate (in percent)	1.35%
Effective interest rate (in percent)	1.486%
Senior Unsecured Notes \| 1.650% notes due July 2030
Debt Instrument [Line Items]
Total senior unsecured notes	$ 500	500
Stated interest rate (in percent)	1.65%
Effective interest rate (in percent)	1.767%
Line of Credit \| Secured Revolving Credit Facility \| Revolving Credit Facility \| Subsidiary
Debt Instrument [Line Items]
Amount outstanding under credit facility	$ 230	$ 48

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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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt classified as noncurrent. Excludes lease obligation.

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