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Summary of Significant Accounting Policies (Recently Adopted Accounting Pronouncements) (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Apr. 29, 2018 | Apr. 30, 2017 | Jan. 29, 2018 | Jan. 28, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Receivables, net | $ 2,296 |  |  | $ 1,952
Other current assets | 887 |  |  | 638
Other accrued expenses | 2,804 |  |  | $ 2,224
Net sales | 24,947 | $ 23,887 |  |
Cost of sales | 16,330 | 15,733 |  |
Gross profit | 8,617 | 8,154 |  |
Selling, general and administrative | 4,779 | $ 4,361 |  |
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) |  |  |
Other current assets | 269 |  |  |
Other accrued expenses | 223 |  |  |
Net sales | 33 |  |  |
Cost of sales | (98) |  |  |
Gross profit | 131 |  |  |
Selling, general and administrative | 131 |  |  |
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 | 2,342 |  |  |
Other current assets | 618 |  |  |
Other accrued expenses | 2,581 |  |  |
Net sales | 24,914 |  |  |
Cost of sales | 16,428 |  |  |
Gross profit | 8,486 |  |  |
Selling, general and administrative | $ 4,648 |  |  |

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