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Summary of Significant Accounting Policies (Recently Adopted Accounting Pronouncements) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 29, 2018 | Jul. 30, 2017 | Jul. 29, 2018 | Jul. 30, 2017 | Jan. 29, 2018 | Jan. 28, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Receivables, net | $ 2,164 |  | $ 2,164 |  |  | $ 1,952
Other current assets | 1,104 |  | 1,104 |  |  | 638
Other accrued expenses | 2,542 |  | 2,542 |  |  | $ 2,224
Net sales | 30,463 | $ 28,108 | 55,410 | $ 51,995 |  |
Cost of sales | 20,098 | 18,647 | 36,428 | 34,380 |  |
Gross profit | 10,365 | 9,461 | 18,982 | 17,615 |  |
Selling, general and administrative | 5,004 | $ 4,549 | 9,783 | $ 8,910 |  |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative effect of change on equity |  |  |  |  | $ 75 |
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] |  |  |  |  |  |
Receivables, net | (46) |  | (46) |  |  |
Other current assets | 272 |  | 272 |  |  |
Other accrued expenses | 226 |  | 226 |  |  |
Net sales | 33 |  | 66 |  |  |
Cost of sales | (119) |  | (217) |  |  |
Gross profit | 152 |  | 283 |  |  |
Selling, general and administrative | 152 |  | 283 |  |  |
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] |  |  |  |  |  |
Receivables, net | 2,210 |  | 2,210 |  |  |
Other current assets | 832 |  | 832 |  |  |
Other accrued expenses | 2,316 |  | 2,316 |  |  |
Net sales | 30,430 |  | 55,344 |  |  |
Cost of sales | 20,217 |  | 36,645 |  |  |
Gross profit | 10,213 |  | 18,699 |  |  |
Selling, general and administrative | $ 4,852 |  | $ 9,500 |  |  |

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