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Summary of Significant Accounting Policies (Recently Adopted Accounting Pronouncements) (Details) - USD ($)
$ in Millions
 3 Months Ended
Apr. 29, 2018
Apr. 30, 2017
Jan. 29, 2018
Jan. 28, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Receivables, net $ 2,296     $ 1,952
Other current assets 887     638
Other accrued expenses 2,804     $ 2,224
Net sales 24,947 $ 23,887    
Cost of sales 16,330 15,733    
Gross profit 8,617 8,154    
Selling, general and administrative 4,779 $ 4,361    
Accounting Standards Update 2014-09 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative effect of change on equity     $ 75  
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Receivables, net (46)      
Other current assets 269      
Other accrued expenses 223      
Net sales 33      
Cost of sales (98)      
Gross profit 131      
Selling, general and administrative 131      
Accounting Standards Update 2014-09 [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Receivables, net 2,342      
Other current assets 618      
Other accrued expenses 2,581      
Net sales 24,914      
Cost of sales 16,428      
Gross profit 8,486      
Selling, general and administrative $ 4,648