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Derivative Financial Instruments (Balance Sheet Classification of Financial Instruments) (Details) (USD $)
In Millions |
Apr. 30, 2011
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Jan. 31, 2011
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Apr. 30, 2010
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|---|---|---|---|
| Other assets and deferred charges | $ 4,068 | $ 4,129 | $ 3,910 |
| Long-term debt | 45,486 | 40,692 | 32,668 |
| Deferred income taxes and other | 6,902 | 6,682 | 5,152 |
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Fair Value Instruments [Member]
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| Other assets and deferred charges | 249 | 267 | |
| Asset subtotals | 249 | 267 | |
| Long-term debt | 249 | 267 | |
| Deferred income taxes and other | |||
| Liability subtotals | 249 | 267 | |
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Net Investment Instrument [Member]
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| Other assets and deferred charges | 165 | 233 | |
| Asset subtotals | 165 | 233 | |
| Long-term debt | |||
| Deferred income taxes and other | |||
| Liability subtotals | |||
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Cash Flow Instruments [Member]
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| Other assets and deferred charges | 241 | 238 | |
| Asset subtotals | 241 | 238 | |
| Long-term debt | |||
| Deferred income taxes and other | 18 | 18 | |
| Liability subtotals | $ 18 | $ 18 |