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Restructuring Charges Restructuring Accrual Activity (Details) - Best Buy Mobile
$ in Millions
9 Months Ended
Nov. 03, 2018
USD ($)
Restructuring Reserve [Roll Forward]  
Restructuring reserve, balance at the beginning of the period $ 8
Charges 50
Cash payments (54)
Adjustments (3) [1]
Restructuring reserve, balance at the end of the period 1
Termination benefits  
Restructuring Reserve [Roll Forward]  
Restructuring reserve, balance at the beginning of the period 8
Charges 1
Cash payments (6)
Adjustments (3) [1]
Restructuring reserve, balance at the end of the period 0
Facility closure and other costs  
Restructuring Reserve [Roll Forward]  
Restructuring reserve, balance at the beginning of the period 0
Charges 49
Cash payments (48)
Adjustments 0
Restructuring reserve, balance at the end of the period $ 1
[1] (1)Adjustments to termination benefits represent changes in retention assumptions.