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Canada Exit - Schedule of Pretax Exit Costs (Details) - Canada Exit - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 15, 2015 | Jan. 30, 2016 | Jan. 31, 2015 | Feb. 01, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Investment impairment |  | $ 6 | $ 4,766 |
Contingent liabilities |  | 62 | 240 |
Other exit costs |  | 61 | 99 |
Total | $ 5,105 | $ 129 | $ 5,105 | $ 0

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