Annual report pursuant to Section 13 and 15(d)

Income Taxes (Narrative) (Details)

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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jan. 27, 2014
Feb. 03, 2018
Feb. 03, 2018
Jan. 28, 2017
Jan. 30, 2016
Operating Loss Carryforwards [Line Items]          
Net tax benefit recorded in connection with U. S. Tax Cuts and Jobs Act   $ 75      
Valuation allowance   767 $ 767 $ 993  
Net tax expense (benefit)     (126) 1 $ 9
Operating loss carryforwards and tax credits, potential offset to future ordinary taxable income   719 719    
Amended rights agreement, stockholder ownership percentage, maximum 4.90%        
Amended rights agreement, Minimum stock ownership percentage by which stockholders are prevented from acquiring additional shares 4.90%        
Amount of unrecognized tax benefits that would impact effective tax rate if recognized   32 32 32 33
Benefit of federal tax deduction of state taxes     7 11 12
Accrued interest and penalties for unrecognized tax benefits   1 1 $ 2 $ 3
Federal [Member]          
Operating Loss Carryforwards [Line Items]          
Net operating loss carryforward   2,100 2,100    
Tax credit carryforwards   $ 58 $ 58