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Revenue (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
May 05, 2018
Apr. 29, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Cumulative effect of adopting accounting standards $ 5 $ 0
Revenue recognized from beginning contract liability balance $ 150  
Disaggregated sales by category 100.00%  
Digitally Enabled Sales [Member]    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Disaggregated sales by category 29.00% 25.00%
Loyalty Program [Member]    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Performance obligations $ 146  
Average period between issuance and redemption 6 months  
Rate of unredeemed performance obligations 5.00%  
Gift Cards [Member]    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Performance obligations $ 314  
Average period between issuance and redemption 2 years  
Rate of unredeemed performance obligations 2.00%  
Accounting Standards Update 2014-09 [Member]    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Cumulative effect of adopting accounting standards $ 55