Disposals, Acquisitions and Related Items (Details)
$ in Millions, R$ in Billions |
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3 Months Ended |
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Aug. 18, 2018
USD ($)
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Jul. 31, 2018
USD ($)
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Apr. 30, 2019
USD ($)
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Jan. 31, 2019
USD ($)
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Aug. 01, 2018
BRL (R$)
|
Aug. 01, 2018
USD ($)
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Apr. 30, 2018
USD ($)
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| Business Acquisition [Line Items] |
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| Goodwill |
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$ 31,416
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$ 31,181
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$ 18,850
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| Flipkart [Member] |
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| Business Acquisition [Line Items] |
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| Noncontrolling Interest, Ownership Percentage by Parent |
81.00%
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| Aggregate ownership, percent |
77.00%
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| Payments to Acquire Businesses, Net of Cash Acquired |
$ 16,000
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| Schedule of Business Acquisitions, by Acquisition [Table Text Block] |
24,100
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| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |
2,200
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| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other |
2,800
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| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |
5,000
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| Goodwill |
13,500
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| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets |
4,700
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| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |
300
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| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |
3,700
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| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities |
1,800
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| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities |
1,800
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| Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value |
$ 4,300
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| Walmart Brazil [Member] |
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| Business Acquisition [Line Items] |
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| Ownership sold, percent |
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80.00%
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80.00%
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| Disposal Group, Including Discontinued Operation, Consideration |
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$ 250
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| (Gain) Loss on Disposition of Business |
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$ 4,800
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| Loss Contingency Accrual |
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$ 800
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| Guarantor Obligations, Maximum Exposure, Undiscounted | R$ |
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R$ 2.3
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| Equity method investment, ownership percentage |
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20.00%
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20.00%
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