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Restructuring Charges (Restructuring Accrual Activity) (Details) - USD ($)
$ in Millions
9 Months Ended
Nov. 02, 2019
Nov. 03, 2018
Best Buy Mobile [Member]    
Restructuring Reserve [Roll Forward]    
Balances   $ 8
Charges   50
Cash payments   (54)
Adjustments [1]   (3)
Balances   1
Best Buy Mobile [Member] | Termination benefits [Member]    
Restructuring Reserve [Roll Forward]    
Balances   8
Charges   1
Cash payments   (6)
Adjustments [1]   (3)
Best Buy Mobile [Member] | Facility closure and other costs [Member]    
Restructuring Reserve [Roll Forward]    
Charges   49
Cash payments   (48)
Balances   $ 1
U.S. Operating Model [Member] | Termination benefits [Member]    
Restructuring Reserve [Roll Forward]    
Balances  
Charges 48  
Cash payments (23)  
Adjustments [2] (7)  
Balances $ 18  
[1] Adjustments represent changes in retention assumptions.
[2] Adjustments are related to higher-than-expected employee retention, and therefore lower severance expenses.