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Summary of Significant Accounting Policies (Schedule of Goodwill) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jan. 31, 2018 | Jan. 31, 2017
Goodwill [Roll Forward] |  |
Goodwill | $ 17,037 | $ 16,695
Changes in currency translation and other | 996 | (1,433)
Acquisitions | 209 | 1,775
Goodwill | 18,242 | 17,037
Walmart U.S. |  |
Goodwill [Roll Forward] |  |
Goodwill | 2,236 | 461
Changes in currency translation and other | 0 | 0
Acquisitions | 209 | 1,775
Goodwill | 2,445 | 2,236
Walmart International |  |
Goodwill [Roll Forward] |  |
Goodwill | 14,488 | 15,921
Changes in currency translation and other | 996 | (1,433)
Acquisitions | 0 | 0
Goodwill | 15,484 | 14,488
Sam's Club |  |
Goodwill [Roll Forward] |  |
Goodwill | 313 | 313
Changes in currency translation and other | 0 | 0
Acquisitions | 0 | 0
Goodwill | $ 313 | $ 313

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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