Cash and Cash Equivalents, Investments and Funds Held for Customers Classified by the stated maturity date (Details) (USD $) In Millions, unless otherwise specified	Oct. 31, 2012	Jul. 31, 2012
Available-for-sale Securities, Debt Maturities
Due within one year, Amortized Cost	$ 216	$ 218
Due within one year, Fair Value	216	218
Due within two years, Amortized Cost	148	134
Due within two years, Fair Value	149	135
Due within three years, Amortized Cost	112	131
Due within three years, Fair Value	112	132
Due after three years, Amortized Cost	73	82
Due after three years, Fair Value	73	82
Total available-for-sale debt securiites, Amortized Cost	549	565
Total available-for-sale debt securiites, Fair Value	$ 550	$ 567

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

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

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

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Amount of available-for-sale debt securities at cost, net of adjustments, which include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

+ References

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

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-Subparagraph (SX 210.5-02.2)

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Amount of available-for-sale debt securities at fair value maturing in the next fiscal year following the latest fiscal year.

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

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-Name Accounting Standards Codification

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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