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Net Sales (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jul. 29, 2018
Jul. 30, 2017
Jul. 29, 2018
Jul. 30, 2017
Disaggregation of Revenue [Line Items]        
Net sales $ 30,463 $ 28,108 $ 55,410 $ 51,995
Inside the U.S. [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 27,852   50,895  
Outside the U.S. [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 2,611   4,515  
Product [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 29,076   52,811  
Service [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 1,387   2,599  
Major Product Line, Building Materials [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 10,678   20,004  
Major Product Line, Hardlines [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 10,143   17,349  
Major Product Line, Décor [Member]        
Disaggregation of Revenue [Line Items]        
Net sales $ 9,642   $ 18,057