Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
Oct. 31, 2021	Oct. 31, 2020	Jul. 31, 2021
Income Tax Disclosure [Abstract]
Excess tax benefits on share-based compensation	$ 47	$ 52
Effective tax rate	4.00%	6.00%
Effective tax rate, excluding discrete tax benefits	25.00%	25.00%
Total amount of unrecognized tax benefits			$ 190
Favorable net impact to income tax expense due to recognition of tax benefits	$ 109
Noncurrent income taxes receivable	$ 75		$ 75

Effective Income Tax Rate Reconciliation, Excluding Discrete Tax Benefits, Percent

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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Carrying amount due after one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes.

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Amount of unrecognized tax benefits.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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