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Goodwill and Intangible Assets - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jul. 29, 2012
Jul. 31, 2011
Nov. 01, 2009
Jul. 29, 2012
Jul. 31, 2011
Jan. 29, 2012
Jan. 30, 2011
Jan. 31, 2010
Feb. 01, 2009
Goodwill [Line Items]                    
Non-cash, pre-tax, goodwill impairment charge       $ (224)         $ (224) [1]  
Number of reporting units where impairment is recorded       4            
Goodwill   3,279     3,279   3,151 3,150 3,149 [1] 3,368
Intangible assets amortization period 11 years                  
Amortization expense   60 61   120 122 244 244 243  
Estimated future amortization expense, 2012             239      
Estimated future amortization expense, 2013             143      
Estimated future amortization expense, 2014             113      
Estimated future amortization expense, 2015             27      
Estimated future amortization expense, 2016             26      
Rexford Albany Municipal Supply Company Incorporated
                   
Goodwill [Line Items]                    
Goodwill             12      
Rexford Albany Municipal Supply Company Incorporated | Customer Relationships
                   
Goodwill [Line Items]                    
Intangible assets             4   2  
Minimum
                   
Goodwill [Line Items]                    
Discount rates used to calculate fair value of reporting unit             13.00%      
Fair value inputs EBITDA multiple             6      
Minimum | Rexford Albany Municipal Supply Company Incorporated | Customer Relationships
                   
Goodwill [Line Items]                    
Intangible assets amortization period             3 years   5 years  
Maximum
                   
Goodwill [Line Items]                    
Discount rates used to calculate fair value of reporting unit             17.00%      
Fair value inputs EBITDA multiple             7      
Maximum | Rexford Albany Municipal Supply Company Incorporated | Customer Relationships
                   
Goodwill [Line Items]                    
Intangible assets amortization period             7 years   7 years  
Water Works
                   
Goodwill [Line Items]                    
Fair value of reporting units in excess of carrying value             17.00%      
Goodwill             1,052 1,040    
Amortization expense   24 23   48 47 95 94 95  
Facilities Maintenance
                   
Goodwill [Line Items]                    
Fair value of reporting units in excess of carrying value             50.00%      
Goodwill             1,474 1,474    
Amortization expense   19 19   38 38 75 75 73  
White Cap
                   
Goodwill [Line Items]                    
Fair value of reporting units in excess of carrying value             68.00%      
Goodwill             109 109    
Amortization expense   5 5   10 10 19 19 20  
Utilities
                   
Goodwill [Line Items]                    
Fair value of reporting units in excess of carrying value             32.00%      
Goodwill             186 197    
Crown Bolt
                   
Goodwill [Line Items]                    
Fair value of reporting units in excess of carrying value             4.00%      
Goodwill             215 215    
Repair And Remodel
                   
Goodwill [Line Items]                    
Fair value of reporting units in excess of carrying value             24.00%      
Goodwill             95 95    
Electrical
                   
Goodwill [Line Items]                    
Fair value of reporting units in excess of carrying value             166.00%      
Goodwill             $ 20 $ 20    
[1] Does not sum due to rounding