Fair Value Disclosures (Other Financial Instruments) (Details) - USD ($) $ in Millions |
Oct. 31, 2015 |
Jan. 31, 2015 |
Nov. 01, 2014 |
|---|---|---|---|
| Fair Value Disclosures [Abstract] | |||
| Long-term debt, excluding unamortized debt issuance costs, including current maturities, Fair Value | $ 4,947 | $ 4,834 | $ 4,910 |
| Long-term debt, excluding unamortized debt issuance costs, including current maturities, carrying amount | 5,329 | $ 5,350 | $ 5,357 |
| Fair Value, Inputs, Level 2 [Member] | |||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||
| Derivative Liability | $ 21 |