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Summary of Significant Accounting Policies - Fiscal Year (Details) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 11 Months Ended 12 Months Ended
Jan. 31, 2012
Feb. 02, 2013
Jan. 31, 2015
Feb. 01, 2014
Fiscal Year [Abstract]        
Adjustment for Fiscal Year-end Change (Note 1) $ 74bby_FiscalYearChangeAdjustmentToCashFlows $ (74)bby_FiscalYearChangeAdjustmentToCashFlows $ 0bby_FiscalYearChangeAdjustmentToCashFlows $ 0bby_FiscalYearChangeAdjustmentToCashFlows
Fiscal Year Change, Adjustments to Cash Flows, Financing Activities 50bby_FiscalYearChangeAdjustmentsToCashFlowsFinancingActivities      
Fiscal Year Change, Adjustment to Cash Flows, Investing Activities $ 18bby_FiscalYearChangeAdjustmentToCashFlowsInvestingActivities      
Number of Months in Fiscal Year   11 months    
Reporting Lag for Certain Foreign Operations in Financial Statements   2 months   1 month
Number of Weeks in Fiscal Year   P48W P52W P52W