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Employee Stock Plans (Narrative) (Details) $ in Millions | 12 Months Ended
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Jan. 28, 2018 USD ($) years_old shares | Jan. 29, 2017 USD ($) shares | Jan. 31, 2016 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of employee stock purchase plans | 2 |  |
Share-based compensation expense | $ | $ 273 | $ 267 | $ 244
2005 Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock authorized | shares | 255,000,000 |  |
Reduction in number of shares available for Issuance | shares | 2.11 |  |
Shares available for future grants | shares | 130,000,000 |  |
Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting rights, percentage | 25.00% |  |
Age at which award becomes non-forfeitable | years_old | 60 |  |
Number of outstanding options vested or expected to vest | shares | 6,000,000 |  |
Unrecognized stock-based compensation expense | $ | $ 23 |  |
Weighted average period over which unrecognized compensation will be recognized | 2 years |  |
Award requisite service period | 5 years |  |
Intrinsic value of option exercises in period | $ | $ 223 | $ 140 | $ 206
Share-based compensation arrangement by share-based payment award, number of options outstanding | shares | 7,196,000 | 8,720,000 |
Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Age at which award becomes non-forfeitable | years_old | 60 |  |
Unrecognized stock-based compensation expense | $ | $ 337 |  |
Weighted average period over which unrecognized compensation will be recognized | 2 years |  |
Share-based compensation arrangement by share-based payment award, maximum period of restrictions lapse | 5 years |  |
Percentage at which restricted stock lapse upon third and sixth anniversaries of date of issuance | 25.00% |  |
Remaining percentage of the restricted stock lapsing upon the associate's attainment of age sixty two | 50.00% |  |
Remaining percentage of restricted stock lapsing upon earlier of associate's attainment of age sixty or the tenth anniversary date | 50.00% |  |
Age when remaining stock lapses if not tenth anniversary of grant date | years_old | 60 |  |
Age when remaining stock lapses | years_old | 62 |  |
Award requisite service period | 5 years |  |
Deferred Compensation, Share-based Payments [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Age at which award becomes non-forfeitable | years_old | 60 |  |
Award requisite service period | 5 years |  |

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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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