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

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[Line Items] for Income Tax [Table]

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Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit)

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Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Provisional Income Tax Expense (Benefit)

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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 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			9 Months Ended		12 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Apr. 30, 2019	Apr. 30, 2018	Jan. 31, 2018	Apr. 30, 2019	Apr. 30, 2018	Jul. 31, 2019	Jul. 31, 2018
Income Tax [Line Items]
Federal statutory income tax rate		26.90%		21.00%	26.90%		26.90%
Provisional income tax benefit			$ 37		$ 27
Provisional charge related to re-measurement of deferred tax positions		$ 10
Share based compensation	$ 20	$ 8		$ 69	$ 41
Effective tax rate	23.00%	26.00%		21.00%	22.00%
Effective income tax rate reconciliation, excluding discrete tax benefits, percent	23.00%				27.00%
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%