Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
Oct. 31, 2019	Oct. 31, 2018	Jul. 31, 2019
Income Tax Disclosure [Abstract]
Tax benefit, share based compensation	$ 29	$ 41
Income tax benefit	35	48
Income (loss) before income taxes	$ 22	$ (14)
Effective tax rate	24.00%	23.00%
Federal statutory income tax rate	21.00%	21.00%
Total amount of unrecognized tax benefits			$ 120
Unrecognized tax benefits, net of related deferred tax assets			75
Favorable net impact to income tax expense due to recognition of tax benefits			$ 75
Changes in unrecognized tax benefits	$ 0
Long-term income tax receivable	$ 52

Unrecognized Tax Benefits, Net of Related Deferred Tax Assets

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

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

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

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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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Amount of increase (decrease) in unrecognized tax benefits attributable to uncertain tax positions taken in tax returns.

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

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