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Comprehensive Income (Tables)
 9 Months Ended
Oct. 31, 2015
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 31, 2015, and November 1, 2014, respectively ($ in millions):
 
Foreign Currency Translation
 
Available-For-Sale Investments
 
Total
Balances at August 1, 2015
$
298

 
$
—

 
$
298

Foreign currency translation adjustments
(2
)
 
—

 
(2
)
Balances at October 31, 2015
$
296

 
$
—

 
$
296

 
 
 
 
 
 
 
Foreign Currency Translation
 
Available-For-Sale Investments
 
Total
Balances at January 31, 2015
$
382

 
$
—

 
$
382

Foreign currency translation adjustments
(19
)
 
—

 
(19
)
Reclassification of foreign currency translation adjustments into earnings due to sale of business
(67
)
 
—

 
(67
)
Balances at October 31, 2015
$
296

 
$
—

 
$
296



 
Foreign Currency Translation
 
Available-For-Sale Investments
 
Total
Balances at August 2, 2014
$
488

 
$
6

 
$
494

Foreign currency translation adjustments
(25
)
 
—

 
(25
)
Unrealized losses on available-for-sale investments
—

 
(1
)
 
(1
)
Balances at November 1, 2014
$
463

 
$
5

 
$
468

 
 
 
 
 
 
 
Foreign Currency Translation
 
Available-For-Sale Investments
 
Total
Balances at February 1, 2014
$
485

 
$
7

 
$
492

Foreign currency translation adjustments
(22
)
 
—

 
(22
)
Unrealized losses on available-for-sale investments
—

 
(2
)
 
(2
)
Balances at November 1, 2014
$
463

 
$
5

 
$
468