Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Narrative) (Details)

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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Apr. 29, 2017
Apr. 30, 2016
Income Tax Contingency [Line Items]    
Income tax expense/(benefit) $ 12 $ 1
Increase to tax valuation allowance for deferred tax assets $ 64  
Valuation allowance, methodologies and assumptions In assessing the need for the valuation allowance, we considered both positive and negative evidence related to the likelihood of realization of the deferred tax assets. As a result of our periodic assessment, our estimate of the realization of deferred tax assets is solely based on the future reversals of existing taxable temporary differences and tax planning strategies that we would make use of to accelerate taxable income to utilize expiring NOL and tax credit carryforwards. Accordingly, in the first quarter of 2017, the valuation allowance was increased by $64 million to offset the net deferred tax assets created in the quarter relating primarily to the increase in NOL carryforwards.  
Other Comprehensive Income Tax Benefit $ 16  
State Audit Settlement 1  
Net operating loss carryforwards $ 2,100  
State and foreign [Member]    
Income Tax Contingency [Line Items]    
State and foreign tax expenses (3)  
Amortization of certain indefinite lived intangible assets [Member]    
Income Tax Contingency [Line Items]    
State and foreign tax expenses (2)  
Federal [Member]    
Income Tax Contingency [Line Items]    
Tax credit carryforwards 62  
Federal tax authority [Member]    
Income Tax Contingency [Line Items]    
Valuation allowance 816  
State Tax Authority [Member]    
Income Tax Contingency [Line Items]    
Valuation allowance $ 241