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Fair Value Measurements (Carrying Value And Fair Value Of Long-Term Debt) (Details) (USD $) In Millions	Jul. 31, 2011	Jan. 31, 2011
Fair Value Measurements
Long-term debt, including amounts due within one year, Carrying Value	$ 47,025	$ 45,347
Long-term debt, including amounts due within one year, Fair Value	$ 50,080	$ 47,012

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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