| Schedule of Debt [Table Text Block] |
| | | | | | | | | | | | | | ($ in millions) | | July 30, 2016 | | August 1, 2015 | | January 30, 2016 | Issue: | | | | | | | 5.65% Senior Notes Due 2020 (1) | | $ | 400 |
| | $ | 400 |
| | $ | 400 |
| 5.75% Senior Notes Due 2018 (1) | | 265 |
| | 300 |
| | 300 |
| 5.875% Senior Secured Notes Due 2023 (1) | | 500 |
| | — |
| | — |
| 6.375% Senior Notes Due 2036 (1) | | 388 |
| | 400 |
| | 400 |
| 6.9% Notes Due 2026 | | 2 |
| | 2 |
| | 2 |
| 7.125% Debentures Due 2023 | | 10 |
| | 10 |
| | 10 |
| 7.4% Debentures Due 2037 | | 313 |
| | 326 |
| | 326 |
| 7.625% Notes Due 2097 | | 500 |
| | 500 |
| | 500 |
| 7.65% Debentures Due 2016 | | 78 |
| | 78 |
| | 78 |
| 7.95% Debentures Due 2017 | | 220 |
| | 220 |
| | 220 |
| 8.125% Senior Notes Due 2019 | | 400 |
| | 400 |
| | 400 |
| 2016 Term Loan Facility | | 1,688 |
| | — |
| | — |
| 2013 Term Loan Facility | | — |
| | 2,205 |
| | 2,194 |
| 2014 Term Loan | | — |
| | 495 |
| | — |
| Total debt, excluding unamortized debt issuance costs, capital leases and note payable | | 4,764 |
| | 5,336 |
| | 4,830 |
| Unamortized debt issuance costs | | (67 | ) | | (83 | ) | | (61 | ) | Total debt, excluding capital leases and note payable | | 4,697 |
| | 5,253 |
| | 4,769 |
| Less: current maturities | | 341 |
| | 28 |
| | 101 |
| Total long-term debt, excluding capital leases and note payable | | $ | 4,356 |
| | $ | 5,225 |
| | $ | 4,668 |
|
| | (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%. |
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