Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Jul. 31, 2011 Years percentage segments	Jul. 31, 2010	Jul. 31, 2009
Compensation and Retirement Disclosure [Abstract]
Maximum percent of salary bonus and commission eligible for executive deferred compensation plan	75.00%
Executive deferred compensation plan liabilities	$ 50	$ 43
Maximum percent of pre tax salary eligible for contribution to employee plan	20.00%
Employer contributions for the first one thousand of salary in percent	150.00%
Portion of salary eligible for maximum employer match	1000
Additional employer contribution for next six percent of salary in percent	75.00%
Additional salary contributed by the employee, in percent	6.00%
Matching contributions	$ 34	$ 32	$ 35

Additional Employer Contribution For Next Six Percent Of Salary In Percent

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Additional salary contributed by the employee in percent.

+ Details

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- Definition

Employer contributions for the first one thousand of salary in percent.

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- Definition

Matching contributions.

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- Definition

Maximum Percent of Pre Tax Salary Eligible For Contribution to Employee Plan.

+ Details

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- Definition

Maximum percent of salary bonus and commission eligible for executive deferred compensation plan.

+ Details

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- Definition

Portion of Salary Eligible for Maximum Employer Match.

+ Details

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- Details

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- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable within one year (or the operating cycle, if longer). Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 30
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20028-108363

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 25
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=6409733&loc=d3e19512-108361

+ Details

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