Earnings Per Share (Details) (USD $) In Millions, except Per Share data	3 Months Ended
Apr. 29, 2011	Apr. 30, 2010
Earnings Per Share [Line Items]
Net income	$ 945	$ 341
Weighted Average Number of Shares Outstanding, Diluted
Basic	1,908	1,961
Weighted Average Number Diluted Shares Outstanding Adjustment	15	12
Diluted	1,923	1,973
Earnings Per Share
Earnings per share - basic	$ 0.50	$ 0.17
Earnings per share - diluted	$ 0.49	$ 0.17
Earnings Per Share Textuals [Abstract]
Stock-based incentive awards, shares excluded from calculation of diluted earnings per share	167	204

Earnings Per Share, Basic and Diluted [Abstract]

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Earnings Per Share [Line Items]

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Earnings Per Share Textuals [Abstract]

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented.

+ References

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-Name Statement of Financial Accounting Standard (FAS)
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The amount of net income or loss for the period per each share of common stock outstanding during the reporting period.

+ References

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The amount of net income or loss for the period per each share of common stock and dilutive common stock equivalents outstanding during the reporting period.

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The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes.

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The sum of dilutive potential common shares used in the calculation of the diluted per-share computation.

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The average number of shares issued and outstanding that are used in calculating diluted EPS, determined based on the timing of issuance of shares in the period.

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Number of [basic] shares, after adjustment for contingently issuable shares and other shares not deemed outstanding, determined by relating the portion of time within a reporting period that common shares have been outstanding to the total time in that period.

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