Effective Income Tax Rate Reconciliation. Share-based Compensation, Excess Tax Benefit, Amount

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

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- Definition

[Line Items] for Income Tax [Table]

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- Definition

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

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- Definition

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 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, 2018	Jan. 31, 2018	Apr. 30, 2017	Apr. 30, 2018	Apr. 30, 2017	Jul. 31, 2018	Jul. 31, 2017
Income Tax [Line Items]
Federal statutory income tax rate	26.90%		35.00%	26.90%	35.00%
Provisional income tax expense (benefit)	$ 5	$ 39		$ 44
Excess tax benefits for provision for income taxes	$ 8		$ 12	$ 41	$ 38
Effective income tax rate reconciliation, excluding discrete tax benefits, percent	26.00%		34.00%	26.00%	34.00%
Effective income tax rate			33.00%		31.00%
Total amount of unrecognized tax benefits							$ 61
Unrecognized tax benefits, net of related deferred tax assets							38
Favorable net impact to income tax expense due to recognition of tax benefits							$ 38
Changes in unrecognized tax benefits				$ 0
Forecast
Income Tax [Line Items]
Federal statutory income tax rate						26.90%