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Restructuring (Schedule of Restructuring and Related Costs) (Details) $ in Millions | 12 Months Ended
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Jan. 31, 2018 USD ($)
Restructuring Cost and Reserve [Line Items] |
Asset impairment charges | $ 1,400
Restructuring charges | 1,201
Walmart International |
Restructuring Cost and Reserve [Line Items] |
Restructuring charges | 236
Sam's Club |
Restructuring Cost and Reserve [Line Items] |
Restructuring charges | 665
Corporate and Other [Member] |
Restructuring Cost and Reserve [Line Items] |
Restructuring charges | 300
Facility Closing [Member] |
Restructuring Cost and Reserve [Line Items] |
Asset impairment charges | 789
Facility Closing [Member] | Walmart International |
Restructuring Cost and Reserve [Line Items] |
Asset impairment charges | 193
Facility Closing [Member] | Sam's Club |
Restructuring Cost and Reserve [Line Items] |
Asset impairment charges | 596
Facility Closing [Member] | Corporate and Other [Member] |
Restructuring Cost and Reserve [Line Items] |
Asset impairment charges | 0
Employee Severance [Member] |
Restructuring Cost and Reserve [Line Items] |
Severance costs | 412
Employee Severance [Member] | Walmart International |
Restructuring Cost and Reserve [Line Items] |
Severance costs | 43
Employee Severance [Member] | Sam's Club |
Restructuring Cost and Reserve [Line Items] |
Severance costs | 69
Employee Severance [Member] | Corporate and Other [Member] |
Restructuring Cost and Reserve [Line Items] |
Severance costs | $ 300

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