Income Taxes (Narrative) (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Oct. 31, 2015 |
Nov. 01, 2014 |
Oct. 31, 2015 |
Nov. 01, 2014 |
|
| Income Tax Contingency [Line Items] | ||||
| Income tax expense/(benefit) | $ 10 | $ 3 | $ 19 | $ (1) |
| Effective tax rate | (6.80%) | (1.60%) | (4.10%) | 0.10% |
| Increase to tax valuation allowance for deferred tax assets | $ 41 | $ 131 | ||
| Valuation allowance | 915 | $ 915 | ||
| 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 assessment, we concluded that, beginning in the second quarter of 2013, our estimate of the realization of deferred tax assets would be based solely 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 carryforwards. Accordingly, in the first quarter of 2015, the valuation allowance was increased to offset the net deferred tax assets created in the quarter relating primarily to the increase in net operating loss (NOL) carryforwards. | |||
| Income tax expense (benefit), tax allocation | (7) | $ (27) | ||
| Net operating loss carryforwards | 2,700 | 2,700 | ||
| State and foreign [Member] | ||||
| Income Tax Contingency [Line Items] | ||||
| State and foreign tax expenses | 1 | 8 | ||
| Amortization of certain indefinite lived intangible assets [Member] | ||||
| Income Tax Contingency [Line Items] | ||||
| State and foreign tax expenses | 2 | 6 | ||
| Valuation Allowance, Adjustment [Member] | ||||
| Income Tax Contingency [Line Items] | ||||
| State and foreign tax expenses | 6 | 6 | ||
| Federal [Member] | ||||
| Income Tax Contingency [Line Items] | ||||
| Tax credit carryforwards | 52 | 52 | ||
| Federal tax authority [Member] | ||||
| Income Tax Contingency [Line Items] | ||||
| Valuation allowance | 692 | 692 | ||
| Net deferred tax asset, NOL and tax credit carryforwards | 259 | 259 | ||
| State Tax Authority [Member] | ||||
| Income Tax Contingency [Line Items] | ||||
| Valuation allowance | $ 223 | $ 223 | ||