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Stock-Based Compensation - Summary of Equity Awards (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
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Jan. 31, 2021 | Jan. 26, 2020 | Jan. 27, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Awards granted (in shares) | 9 |  |
Weighted average grant date fair value (in dollars per share) | $ 307.25 |  |
Shares purchased (in shares) | 1 | 1 | 1
Summary of unearned SBC expense |  |  |
Unearned stock-based compensation expense | $ 3,170 |  |
RSUs, PSUs and Market-based PSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Awards granted (in shares) | 9 | 7 | 4
Estimated total grant-date fair value | $ 2,764 | $ 1,282 | $ 1,109
Weighted average grant date fair value (in dollars per share) | $ 307.25 | $ 184.47 | $ 258.26
Summary of unearned SBC expense |  |  |
Estimated weighted average amortization period | 2 years 6 months |  |
Employee Stock Purchase Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average grant date fair value (in dollars per share) | $ 67.65 | 64.87 | 38.51
Weighted average price (in dollars per share) | $ 139.19 | $ 148.76 | $ 107.48
Summary of unearned SBC expense |  |  |
Estimated weighted average amortization period | 10 months 24 days |  |
Fair Value Assumptions |  |  |
Risk free interest rate, minimum | 0.10% | 1.50% | 1.60%
Risk free interest rate, maximum | 1.60% | 2.60% | 2.80%
Volatility rate, minimum | 26.00% | 30.00% | 24.00%
Volatility rate, maximum | 89.00% | 82.00% | 75.00%
Employee Stock Purchase Plan | Minimum |  |  |
Fair Value Assumptions |  |  |
Weighted average expected life (in years) | 1 month 6 days | 1 month 6 days | 1 month 6 days
Dividend yield | 0.10% | 0.30% | 0.30%
Employee Stock Purchase Plan | Maximum |  |  |
Fair Value Assumptions |  |  |
Weighted average expected life (in years) | 2 years | 2 years | 2 years
Dividend yield | 0.30% | 0.40% | 0.40%

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- Definition The total grant-date fair value of restricted stock units (RSUs) granted during the reporting period. Fair value of RSUs is determined using the closing trading price of our common stock on grant date. + References No definition available. + Details
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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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