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Debt and Credit Facilities Long Term Debt (Details) - USD ($)
$ in Millions
Aug. 01, 2015
Jan. 31, 2015
Aug. 02, 2014
Debt Instrument [Line Items]      
Notes $ 1,248 $ 1,247 $ 1,247
Japan Term Loan 100 106 146
Total long-term debt 1,348 1,353 1,393
Less: Current portion (20) (21) (24)
Total long-term debt, less current portion $ 1,328 $ 1,332 $ 1,369