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Debt and Credit Facilities Long Term Debt (Details) - USD ($)
$ in Millions
Oct. 31, 2015
Jan. 31, 2015
Nov. 01, 2014
Debt Instrument [Line Items]      
Notes $ 1,248 $ 1,247 $ 1,247
Japan Term Loan 104 106 133
Total long-term debt 1,352 1,353 1,380
Less: Current portion (21) (21) (22)
Total long-term debt, less current portion $ 1,331 $ 1,332 $ 1,358