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Long-Term Debt (Tables)
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12 Months Ended |
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Jan. 31, 2015
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| Debt Disclosure [Abstract] |
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| Schedule of Debt |
| | | | | | | | | | ($ in millions) | | 2014 | | 2013 | Issue: | | | | | 5.65% Senior Notes Due 2020(1) | | $ | 400 |
| | $ | 400 |
| 5.75% Senior Notes Due 2018(1) | | 300 |
| | 300 |
| 6.375% Senior Notes Due 2036(1) | | 400 |
| | 400 |
| 6.875% Medium-Term Notes Due 2015 | | — |
| | 200 |
| 6.9% Notes Due 2026 | | 2 |
| | 2 |
| 7.125% Debentures Due 2023 | | 10 |
| | 10 |
| 7.4% Debentures Due 2037 | | 326 |
| | 326 |
| 7.625% Notes Due 2097 | | 500 |
| | 500 |
| 7.65% Debentures Due 2016 | | 78 |
| | 200 |
| 7.95% Debentures Due 2017 | | 220 |
| | 285 |
| 8.125% Senior Notes Due 2019 | | 400 |
| | — |
| 2013 Term Loan Facility | | 2,216 |
| | 2,239 |
| 2014 Term Loan | | 498 |
| | — |
| Total debt, excluding capital leases and note payable | | 5,350 |
| | 4,862 |
| Less: current maturities | | 28 |
| | 23 |
| Total long-term debt, excluding capital leases and note payable | | $ | 5,322 |
| | $ | 4,839 |
| Weighted-average interest rate at year end | | 6.4 | % | | 6.5 | % | Weighted-average maturity (in years) | | 14 years |
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| | (1) | These debt issuances contain a change of control provision that would obligate us, at the holders’ option, to repurchase the debt at a price of 101%. These provisions trigger if there were a beneficial ownership change of 50% or more of our common stock. |
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| Schedule of Extinguishment of Debt [Table Text Block] |
| | | | | | | | | | | | | | | | | | | | | | Title of Security | | Principal Amount Outstanding Prior to 2014 Tender Offers ($ in millions) | | Tender Premium(1) | | Principal Amount Tendered ($ in millions) | | Principal Amount Accepted for Purchase ($ in millions) | | Principal Amount Outstanding After the 2014 Tender Offers ($ in millions) | 6.875% Medium-Term Notes due 2015 | | $ | 200 |
| | $ | 67.50 |
| | $ | 140 |
| | $ | 140 |
| | $ | 60 |
| 7.65% Debentures due 2016 | | 200 |
| | 105.00 |
| | 122 |
| | 122 |
| | 78 |
| 7.95% Debentures due 2017 | | 285 |
| | 97.50 |
| | 194 |
| | 65 |
| | 220 |
| Total | | $ | 685 |
| | | | $ | 456 |
| | $ | 327 |
| | $ | 358 |
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| | (1) | Per $1,000 principal amount of Securities. |
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| Schedule of Maturities of Long-term Debt |
| | | | | ($ in millions) | | 2015 | $ | 28 |
| 2016 | 106 |
| 2017 | 248 |
| 2018 | 2,454 |
| 2019 | 878 |
| Thereafter | 1,636 |
| Total | $ | 5,350 |
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