Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jan. 31, 2022	Jan. 31, 2021	Oct. 31, 2020	Jan. 31, 2022	Jan. 31, 2021	Jul. 31, 2021
Income Tax Disclosure [Abstract]
Excess tax benefits on share-based compensation	$ 62	$ 12		$ 109	$ 64
Income tax (benefit) provision	70	(2)		60	(14)
Income before income taxes	$ 30	$ 22		$ 268	$ 232
Effective tax rate	25.00%	8.00%		25.00%	6.00%
Total amount of unrecognized tax benefits						$ 190
Favorable net impact to income tax expense due to recognition of tax benefits	$ 109			$ 109
Noncurrent income taxes receivable	$ 75			$ 75		$ 75
Effective tax rate, excluding discrete tax benefits		26.00%	25.00%		26.00%

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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+ Details

- Definition

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

+ References + Details