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Summary of Significant Accounting Policies (Recently Adopted Accounting Pronouncements) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 28, 2018 | Oct. 29, 2017 | Oct. 28, 2018 | Oct. 29, 2017 | Jan. 29, 2018 | Jan. 28, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Deferred Revenue | $ (1,858) |  | $ (1,858) |  |  | $ (1,805)
Other Liabilities, Noncurrent | 2,352 |  | 2,352 |  |  | 2,614
Revenue from Contract with Customer, Excluding Assessed Tax | 26,302 | $ 25,026 | 81,712 | $ 77,021 |  |
Receivables, net | 2,171 |  | 2,171 |  |  | 1,952
Other current assets | 1,120 |  | 1,120 |  |  | 638
Other accrued expenses | 2,685 |  | 2,685 |  |  | $ 2,224
Cost of sales | 17,151 | 16,378 | 53,579 | 50,758 |  |
Gross profit | 9,151 | 8,648 | 28,133 | 26,263 |  |
Selling, general and administrative | 4,808 | $ 4,514 | 14,591 | $ 13,424 |  |
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Deferred Revenue |  |  |  |  | $ 99 |
Other Liabilities, Noncurrent |  |  |  |  | 24 |
Revenue from Contract with Customer, Excluding Assessed Tax | 64 |  | 130 |  |  |
Receivables, net | (44) |  | (44) |  |  |
Other current assets | 268 |  | 268 |  |  |
Other accrued expenses | 224 |  | 224 |  |  |
Cost of sales | (83) |  | (300) |  |  |
Gross profit | 147 |  | 430 |  |  |
Selling, general and administrative | 147 |  | 430 |  |  |
Accounting Standards Update 2014-09 [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 26,238 |  | 81,582 |  |  |
Receivables, net | 2,215 |  | 2,215 |  |  |
Other current assets | 852 |  | 852 |  |  |
Other accrued expenses | 2,461 |  | 2,461 |  |  |
Cost of sales | 17,234 |  | 53,879 |  |  |
Gross profit | 9,004 |  | 27,703 |  |  |
Selling, general and administrative | $ 4,661 |  | $ 14,161 |  |  |
Retained Earnings [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative effect of change on equity |  |  |  |  | $ 75 |

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