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Segments (Segment Reporting Information) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2017 | Jan. 31, 2017 | Oct. 31, 2016 | Jul. 31, 2016 | Apr. 30, 2016 | Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 135,150 | $ 122,136 | $ 121,949 | $ 116,526 | $ 129,750 | $ 117,176 | $ 119,405 | $ 114,986 | $ 495,761 | $ 481,317 | $ 478,614
Operating income (loss) |  |  |  |  |  |  |  |  | 20,437 | 22,764 | 24,105
Interest, net |  |  |  |  |  |  |  |  | (2,178) | (2,267) | (2,467)
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  |  | (3,136) | 0 | 0
Income before income taxes |  |  |  |  |  |  |  |  | 15,123 | 20,497 | 21,638
Total assets | 204,522 |  |  |  | 198,825 |  |  |  | 204,522 | 198,825 | 199,581
Depreciation and amortization |  |  |  |  |  |  |  |  | 10,529 | 10,080 | 9,454
Capital expenditures |  |  |  |  |  |  |  |  | 10,051 | 10,619 | 11,477
Walmart U.S. |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 318,477 | 307,833 | 298,378
Operating income (loss) |  |  |  |  |  |  |  |  | 17,869 | 17,745 | 19,087
Total assets | 104,347 |  |  |  | 104,262 |  |  |  | 104,347 | 104,262 | 103,109
Depreciation and amortization |  |  |  |  |  |  |  |  | 3,655 | 3,298 | 2,800
Capital expenditures |  |  |  |  |  |  |  |  | 5,680 | 6,090 | 6,728
Walmart International |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 118,068 | 116,119 | 123,408
Operating income (loss) |  |  |  |  |  |  |  |  | 5,352 | 5,758 | 5,346
Total assets | 81,549 |  |  |  | 74,508 |  |  |  | 81,549 | 74,508 | 73,720
Depreciation and amortization |  |  |  |  |  |  |  |  | 2,601 | 2,629 | 2,549
Capital expenditures |  |  |  |  |  |  |  |  | 2,607 | 2,697 | 2,930
Sam's Club |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 59,216 | 57,365 | 56,828
Operating income (loss) |  |  |  |  |  |  |  |  | 982 | 1,671 | 1,820
Total assets | 13,418 |  |  |  | 14,125 |  |  |  | 13,418 | 14,125 | 13,998
Depreciation and amortization |  |  |  |  |  |  |  |  | 466 | 487 | 472
Capital expenditures |  |  |  |  |  |  |  |  | 626 | 639 | 695
Corporate and support |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating income (loss) |  |  |  |  |  |  |  |  | (3,766) | (2,410) | (2,148)
Total assets | $ 5,208 |  |  |  | $ 5,930 |  |  |  | 5,208 | 5,930 | 8,754
Depreciation and amortization |  |  |  |  |  |  |  |  | 3,807 | 3,666 | 3,633
Capital expenditures |  |  |  |  |  |  |  |  | $ 1,138 | $ 1,193 | $ 1,124

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