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

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[Line Items] for Income Tax [Table]

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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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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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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 excess tax benefit for share-based compensation cost.

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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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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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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Oct. 31, 2018	Oct. 31, 2017	Jul. 31, 2019	Jul. 31, 2018
Income Tax [Line Items]
Federal statutory income tax rate	21.00%			26.90%
Share-based compensation, excess tax benefit, amount	$ 41	$ 25
Income tax benefit	48	35
Pretax loss	$ 14	$ 37
Effective income tax rate reconciliation, excluding discrete tax benefits, percent	23.00%	33.00%
Effective income tax rate		95.00%
Total amount of unrecognized tax benefits				$ 90
Unrecognized tax benefits, net of related deferred tax assets				57
Favorable net impact to income tax expense due to recognition of tax benefits				$ 57
Changes in unrecognized tax benefits	$ 0
Forecast
Income Tax [Line Items]
Federal statutory income tax rate			21.00%