Cash and Cash Equivalents, Investments and Funds Held for Customers By Classified by the stated maturity date (Details) (USD $) In Millions, unless otherwise specified	Jan. 31, 2012	Jul. 31, 2011
Cash and Cash Equivalents Items [Line Items]
Available-for-sale Securities, Debt Maturities, within One Year, Amortized Cost Basis	$ 299	$ 267
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value	299	267
Available For Sale Securities Debt Maturities Within two Year Amortized Cost	313	323
Available For Sale Securities Debt Maturities Within two Year Fair Value	314	324
Available For Sale Securities Debt Maturities Within Three Year Amortized Cost	171	190
Available For Sale Securities Debt Maturities Within Three Year Fair Value	171	191
Available For Sale Securities Debt Maturities After Three Years Amortized Cost	127	151
Available For Sale Securities Debt Maturities After three Years Fair Value	127	151
Available-for-sale Securities, Amortized Cost Basis	910	931
Available-for-sale Securities, Debt Securities	$ 911	$ 933

Available For Sale Securities Debt Maturities After Three Years Amortized Cost.

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- Definition

Available For Sale Securities Debt Maturities After Three Years Fair Value.

+ References

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- Definition

Available For Sale Securities Debt Maturities Within Three Year Amortized Cost.

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Available For Sale Securities Debt Maturities Within Three Year Fair Value.

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- Definition

Available For Sale Securities Debt Maturities Within two Year Amortized Cost.

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- Definition

Available For Sale Securities Debt Maturities Within two Year Fair Value.

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- Definition

This item represents the total of all debt securities grouped by maturity dates, at cost, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments, as defined), and fair value hedge accounting adjustments, if any, which are classified neither as held-to-maturity nor trading securities.

+ References

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-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 7

-Footnote 2

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 20

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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- Definition

This item represents debt securities, at cost, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments, as defined), and fair value hedge accounting adjustments, if any, which are expected to mature within one year of the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

+ References

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-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 7

-Footnote 2

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Paragraph 20

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

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- Definition

This item represents the fair value of debt securities which are expected to mature within one year of the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Number 115

-Paragraph 20

-Subparagraph a

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

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- Definition

For an unclassified balance sheet, total of debt securities categorized neither as held-to-maturity nor trading.

+ References

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