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Restructuring Charges Restructuring Accrual Activity (Details) - Best Buy Mobile
$ in Millions
6 Months Ended
Aug. 04, 2018
USD ($)
Restructuring Reserve [Roll Forward]  
Restructuring reserve, balance at the beginning of the period $ 8
Charges 50
Cash payments (51)
Adjustments (4) [1]
Restructuring reserve, balance at the end of the period 3
Termination benefits  
Restructuring Reserve [Roll Forward]  
Restructuring reserve, balance at the beginning of the period 8
Charges 1
Cash payments (5)
Adjustments (3) [1]
Restructuring reserve, balance at the end of the period 1
Facility closure and other costs  
Restructuring Reserve [Roll Forward]  
Restructuring reserve, balance at the beginning of the period 0
Charges 49
Cash payments (46)
Adjustments (1) [1]
Restructuring reserve, balance at the end of the period $ 2
[1] (1)Adjustments to termination benefits represent changes in retention assumptions. Adjustments to facility closure and other costs represent changes in sublease assumptions