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Net Sales (Details) - USD ($) $ in Millions | 3 Months Ended
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Apr. 29, 2018 | Apr. 30, 2017
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 24,947 | $ 23,887
Inside the U.S. [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 23,043 |
Outside the U.S. [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 1,904 |
Product [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 23,735 |
Service [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 1,212 |
Major Product Line, Building Materials [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 9,326 |
Major Product Line, Hardlines [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 8,415 |
Major Product Line, Décor [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 7,206 |

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