Investments (Details) (USD $) In Millions	3 Months Ended	12 Months Ended
Apr. 29, 2011	Jan. 28, 2011
Investments:
Unrealized gains of debt securities	$ 2	$ 2
Unrealized losses of debt securities	(1)	(1)
Total investments at fair value	1,180	1,156
Total investments at amortized cost	1,179	1,155
Available for sale securities contractual maturity period	less than five years
Short-term Investments [Member]
Investments:
Fair value of debt securities	418	452
Amortized cost of debt securities	418	451
Unrealized gains of debt securities	0	1
Unrealized losses of debt securities	0	0
Short-term Investments [Member] \| US Government Corporations and Agencies Securities [Member]
Investments:
Fair value of debt securities	7	58
Amortized cost of debt securities	7	58
Unrealized gains of debt securities	0	0
Unrealized losses of debt securities	0	0
Short-term Investments [Member] \| Domestic Corporate Debt Securities [Member]
Investments:
Fair value of debt securities	252	254
Amortized cost of debt securities	252	253
Unrealized gains of debt securities	0	1
Unrealized losses of debt securities	0	0
Short-term Investments [Member] \| Foreign Corporate Debt Securities [Member]
Investments:
Fair value of debt securities	159	140
Amortized cost of debt securities	159	140
Unrealized gains of debt securities	0	0
Unrealized losses of debt securities	0	0
Long term investments [Member]
Investments:
Fair value of debt securities	762	704
Amortized cost of debt securities	761	704
Unrealized gains of debt securities	2	1
Unrealized losses of debt securities	(1)	(1)
Long term investments [Member] \| US Government Corporations and Agencies Securities [Member]
Investments:
Fair value of debt securities	20	21
Amortized cost of debt securities	20	20
Unrealized gains of debt securities	0	1
Unrealized losses of debt securities	0	0
Long term investments [Member] \| Domestic Corporate Debt Securities [Member]
Investments:
Fair value of debt securities	306	242
Amortized cost of debt securities	306	243
Unrealized gains of debt securities	1	0
Unrealized losses of debt securities	(1)	(1)
Long term investments [Member] \| Foreign Corporate Debt Securities [Member]
Investments:
Fair value of debt securities	307	317
Amortized cost of debt securities	306	317
Unrealized gains of debt securities	1	0
Unrealized losses of debt securities	0	0
Long term investments [Member] \| Equity and Other Securities [Member]
Investments:
Fair value of equity and other securities	129	124
Amortized cost of equity and other securities	129	124
Unrealized gains of equity and other securities	0	0
Unrealized losses of equity and other securities	$ 0	$ 0

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This item represents the cost of debt and equity securities, which are categorized either as available for sale or trading securities, net of adjustments made for accretion, amortization, other-than-temporary impairments, and hedging, if any.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities and Trading Securities which consist of all investments not classified as held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt.

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Unrealized Gains Of Equity And Other Securities

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments made for accretion, amortization, other-than-temporary impairments, and hedging, if any.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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-Name Statement of Financial Accounting Standard (FAS)
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This item represents the gross unrealized gains for securities which are categorized neither as held-to-maturity nor trading securities. Such gross unrealized gains are the excess of the fair value of the Available-for-sale Securities over their carrying value as of the reporting date. Such gross unrealized gains are included in other comprehensive income in the statement of shareholders' equity, unless the Available-for-sale Security is designated as a hedge. All or a portion of the unrealized holding gain of an available-for-sale security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge.

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This item represents the gross unrealized losses for securities which are categorized neither as held-to-maturity nor trading securities. Such gross unrealized losses are the excess of the carrying value of the Available-for-sale Securities over their fair value as of the reporting date. Such gross unrealized losses are included in other comprehensive income in the statement of shareholders' equity, unless the Available-for-sale Security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding loss of an Available-for-sale Security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge, as should other than temporary declines in fair value below costs basis.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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The total of financial instruments that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for debt and equity securities formerly categorized as available-for-sale or held-to-maturity which the entity held as of the date it opted to account for such securities at fair value. An enterprise may also categorize such a security as trading without the intent to sell it in the near term assuming the decision to categorize the security as trading occurred at acquisition; this is the reason why the trading category of investments in debt and equity securities are bought and sold "principally" for sale in the near term. Transfers into and out of the trading category should be rare. Such financial instruments that are held as of the reporting date are measured at fair value with unrealized holding gains and losses (the difference between fair value and the previously reported carrying amount) included in earnings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Trading Securities which consist of all investments in certain debt and equity securities that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for which an entity has elected the fair value option. Trading generally reflects active and frequent buying and selling, and trading securities are generally used with the objective of generating profits on short-term differences in price, but this category of investments may also include items which are not intended to be sold in the near term or for which the fair value option has been elected.

+ References

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