Fair Value Disclosures (Other Financial Instruments) (Details) - USD ($) $ in Millions |
Aug. 01, 2015 |
Jan. 31, 2015 |
Aug. 02, 2014 |
|---|---|---|---|
| Fair Value Disclosures [Abstract] | |||
| Long-term debt, excluding unamortized debt issuance costs, including current maturities, Fair Value | $ 5,002 | $ 4,834 | $ 5,072 |
| Long-term debt, excluding unamortized debt issuance costs, including current maturities, carrying amount | 5,336 | $ 5,350 | $ 5,351 |
| Fair Value, Inputs, Level 2 [Member] | |||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||
| Derivative Liability | $ 11 |