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Segment Reporting (Revenue from External Customers by Products and Services) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jan. 28, 2018
Oct. 29, 2017
Jul. 30, 2017
Apr. 30, 2017
Jan. 29, 2017
Oct. 30, 2016
Jul. 31, 2016
May 01, 2016
Jan. 28, 2018
Jan. 29, 2017
Jan. 31, 2016
Revenue from External Customer [Line Items]                      
Net sales $ 23,883 $ 25,026 $ 28,108 $ 23,887 $ 22,207 $ 23,154 $ 26,472 $ 22,762 $ 100,904 $ 94,595 $ 88,519
% of Net Sales                 100.00% 100.00% 100.00%
Product [Member]                      
Revenue from External Customer [Line Items]                      
Net sales                 $ 95,956 $ 90,028 $ 84,130
Service [Member]                      
Revenue from External Customer [Line Items]                      
Net sales                 4,948 4,567 4,389
Appliances [Member]                      
Revenue from External Customer [Line Items]                      
Net sales                 $ 8,147 $ 7,362 $ 6,539
% of Net Sales                 8.10% 7.80% 7.40%
Building Materials [Member]                      
Revenue from External Customer [Line Items]                      
Net sales                 $ 7,342 $ 6,774 $ 6,416
% of Net Sales                 7.30% 7.20% 7.20%
Decor [Member]                      
Revenue from External Customer [Line Items]                      
Net sales                 $ 3,057 $ 2,906 $ 2,730
% of Net Sales                 3.00% 3.10% 3.10%
Electrical [Member]                      
Revenue from External Customer [Line Items]                      
Net sales                 $ 5,037 $ 4,561 $ 4,291
% of Net Sales                 5.00% 4.80% 4.80%
Flooring [Member]                      
Revenue from External Customer [Line Items]                      
Net sales                 $ 7,078 $ 6,477 $ 6,215
% of Net Sales                 7.00% 6.80% 7.00%
Hardware [Member]                      
Revenue from External Customer [Line Items]                      
Net sales                 $ 5,891 $ 5,629 $ 5,296
% of Net Sales                 5.80% 6.00% 6.00%
Indoor Garden [Member]                      
Revenue from External Customer [Line Items]                      
Net sales                 $ 9,639 $ 9,204 $ 8,227
% of Net Sales                 9.60% 9.70% 9.30%
Kitchen And Bath [Member]                      
Revenue from External Customer [Line Items]                      
Net sales                 $ 7,377 $ 7,184 $ 6,909
% of Net Sales                 7.30% 7.60% 7.80%
Lighting [Member]                      
Revenue from External Customer [Line Items]                      
Net sales                 $ 4,409 $ 4,423 $ 4,249
% of Net Sales                 4.40% 4.70% 4.80%
Lumber [Member]                      
Revenue from External Customer [Line Items]                      
Net sales                 $ 7,790 $ 6,828 $ 6,284
% of Net Sales                 7.70% 7.20% 7.10%
Millwork [Member]                      
Revenue from External Customer [Line Items]                      
Net sales                 $ 5,382 $ 5,139 $ 4,937
% of Net Sales                 5.30% 5.40% 5.60%
Outdoor Garden [Member]                      
Revenue from External Customer [Line Items]                      
Net sales                 $ 7,030 $ 6,789 $ 6,505
% of Net Sales                 7.00% 7.20% 7.30%
Paint [Member]                      
Revenue from External Customer [Line Items]                      
Net sales                 $ 7,990 $ 7,666 $ 7,497
% of Net Sales                 7.90% 8.10% 8.50%
Plumbing [Member]                      
Revenue from External Customer [Line Items]                      
Net sales                 $ 7,356 $ 6,985 $ 6,364
% of Net Sales                 7.30% 7.40% 7.20%
Tools [Member]                      
Revenue from External Customer [Line Items]                      
Net sales                 $ 7,379 $ 6,668 $ 6,060
% of Net Sales                 7.30% 7.00% 6.80%