Warranty and Deferred Extended Warranty Revenue (Details) (USD $) In Millions	3 Months Ended	9 Months Ended
Oct. 28, 2011	Oct. 29, 2010	Oct. 28, 2011	Oct. 29, 2010
Warranty liability:
Warranty liability at beginning of period	$ 944	$ 976	$ 895	$ 912
Costs Accrued For New Warranty Contracts And Changes In Estimates For Pre Existing Warranties	223	260	779	868
Service obligations honored	(252)	(286)	(759)	(830)
Warranty liability at end of period	915	950	915	950
Current portion	588	627	588	627
Non-current portion	327	323	327	323
Warranty liability at end of period	915	950	915	950
Deferred extended warranty revenue:
Deferred extended warranty revenue at beginning of period	6,794	6,109	6,416	5,910
Revenue deferred for new extended warranties	1,004	1,035	3,192	2,890
Revenue Recognized	(936)	(845)	(2,746)	(2,501)
Deferred extended warranty revenue at end of period	6,862	6,299	6,862	6,299
Current portion	3,212	2,910	3,212	2,910
Non-current portion	3,650	3,389	3,650	3,389
Deferred extended warranty revenue at end of period	$ 6,862	$ 6,299	$ 6,862	$ 6,299

Represents the aggregate increase (decrease) in the liability during the reporting period for accruals related to newly issued and preexisting standard product warranties (including adjustments related to changes in estimates). Does not include any increase (decrease) in the liability for accruals related to extended product warranties

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Deferred Extended Warranty Revenue [Abstract]

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Amount of previously reported deferred or unearned revenue for extended warranty that was recognized as revenue during the period. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized.

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Amount as of the balance sheet date of the aggregate extended product warranty liability. Does not include the ending balance for the standard product warranty liability.

+ References

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Amount at end of the reporting period of the aggregate extended product warranty liability that is expected to be paid within one year of the balance sheet date or normal operating cycle, if longer. Does not include the balance for the standard product warranty liability.

+ References

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Amount at end of the reporting period of the aggregate extended product warranty liability that is expected to be paid after one year from the balance sheet date or normal operating cycle, if longer. Does not include the balance for the standard product warranty liability.

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

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Represents the aggregate increase in the liability for accruals related to extended product warranties issued during the reporting period. Does not include any increase in the liability for accruals related to standard product warranties.

+ References

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

-Publisher FASB

-Name FASB Interpretation (FIN)

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-Paragraph 14

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability.

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Amount as of the balance sheet date of the aggregate standard product warranty liability that is expected to be paid within one year or the normal operating cycle, if longer. Does not include the balance for the extended product warranty liability.

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Amount as of the balance sheet date of the aggregate standard product warranty liability that is expected to be paid after one year or beyond the normal operating cycle, if longer. Does not include the balance for the extended product warranty liability.

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Represents the aggregate decrease in the liability for payments made (in cash or in kind) to satisfy claims under the terms of the standard product warranty. Does not include any Increase or Decrease in the liability for payments related to extended product warranties.

+ References

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

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 45

-Paragraph 14

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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