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Cash Equivalents (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 30, 2016
Jan. 31, 2015
Cash Equivalents.    
Cash and cash equivalents, short-term investments $ 3,008 $ 1,520
Credit and debit card transactions to be included in cash equivalents, maximum settlement period 5 days  
Receivables from third-party credit and debit card sales within Retail Segment, included in cash equivalents $ 375 $ 379