Valuation and Qualifying Accounts Schedule II (Details) - USD ($) $ in Millions	12 Months Ended
Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Allowance for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances and reserves, beginning balance	$ 45	$ 40	$ 38
Valuation allowances and reserves, additions charged to expense/revenue	49	57	50
Valuation allowances and reserves, deductions	(43)	(52)	(48)
Valuation allowances and reserves, ending balance	51	45	40
Reserve for product returns
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances and reserves, beginning balance	12	15	14
Valuation allowances and reserves, additions charged to expense/revenue	70	79	87
Valuation allowances and reserves, deductions	(75)	(82)	(86)
Valuation allowances and reserves, ending balance	7	12	15
Reserve for rebates
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances and reserves, beginning balance	12	21	14
Valuation allowances and reserves, additions charged to expense/revenue	103	97	103
Valuation allowances and reserves, deductions	(101)	(106)	(96)
Valuation allowances and reserves, ending balance	$ 14	$ 12	$ 21

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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- Definition

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

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- Definition

Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to costs and expenses.

+ References

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- Definition

Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively.

+ References

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