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Summary of Significant Accounting Policies (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Jan. 31, 2018 USD ($) | Jan. 31, 2017 USD ($) | Jan. 31, 2016 USD ($) | Feb. 01, 2018 USD ($) | Jan. 31, 2015 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |
Customers per week, approximate | 270,000,000 |  |  |  |
Number of stores | 11,700 |  |  |  |
Banners | 65 |  |  |  |
Number of countries | 28 |  |  |  |
Amounts due from banks | $ 1,600 | $ 1,500 |  |  |
Restricted cash and cash equivalents | 300 | 265 |  |  |
Cash and cash equivalents | 6,756 | 6,867 | $ 8,705 |  | $ 9,135
Cash held in foreign countries | 6,800 | 5,900 |  |  |
Nonrepatriable cash and cash equivalents | 1,400 | 1,000 |  |  |
Depreciation and amortization of property and equipment, property under financing obligations and property under capital leases | 10,500 | 10,100 | 9,500 |  |
Advertising expense | 3,100 | 2,900 | 2,500 |  |
Pre-opening costs | 106 | $ 131 | $ 271 |  |
Other Noncurrent Assets [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Restricted cash recorded as noncurrent asset | $ 258 |  |  |  |
Subsequent Event [Member] | Accounting Standards Update 2016-01 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative adjustment to retained earnings |  |  |  | $ 2,900 |

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