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Comprehensive Income (Tables)
 9 Months Ended
Oct. 28, 2017
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
The following tables provide a reconciliation of the components of accumulated other comprehensive income, net of tax, attributable to Best Buy Co., Inc. for the three and nine months ended October 28, 2017, and October 29, 2016 ($ in millions):
 
Foreign Currency Translation
Balances at July 29, 2017
$
321

Foreign currency translation adjustments
(17
)
Balances at October 28, 2017
$
304

 
 
Balances at January 28, 2017
$
279

Foreign currency translation adjustments
25

Balances at October 28, 2017
$
304

 
 
Balances at July 30, 2016
$
296

Foreign currency translation adjustments
(19
)
Balances at October 29, 2016
$
277

 
 
Balances at January 30, 2016
$
271

Foreign currency translation adjustments
6

Balances at October 29, 2016
$
277