Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2013	Jul. 31, 2013
Income Tax Disclosure [Abstract]
Effective tax rate	31.00%	17.00%	30.00%
Effective tax rate excluding the impact of discrete tax items	34.00%		34.00%
Federal statutory income tax rate	35.00%		35.00%	35.00%
Income tax benefit	$ (17)	$ 13	$ (40)	$ (12)
Income loss before income taxes	(54)	78	(134)	(1)
Total amount of unrecognized tax benefits					39
Unrecognized tax benefits, net of related deferred tax assets					27
Favorable net impact to income tax expense due to recognition of tax benefits					$ 27

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

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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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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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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 pertaining 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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