| Schedule of Debt [Table Text Block] |
| | | | | | | | | | | | | | ($ in millions) | | May 5, 2018 | | April 29, 2017 | | February 3, 2018 | Issue: | | | | | | | 5.75% Senior Notes Due 2018 (1) | | $ | — |
| | $ | 265 |
| | $ | 190 |
| 8.125% Senior Notes Due 2019 (1) | | 50 |
| | 400 |
| | 175 |
| 5.65% Senior Notes Due 2020 (1) | | 110 |
| | 400 |
| | 360 |
| 2017 Credit Facility | | 351 |
| | — |
| | — |
| 2016 Term Loan Facility (Matures in 2023) | | 1,614 |
| | 1,657 |
| | 1,625 |
| 5.875% Senior Secured Notes Due 2023 (1) | | 500 |
| | 500 |
| | 500 |
| 7.125% Debentures Due 2023 | | 10 |
| | 10 |
| | 10 |
| 8.625% Senior Secured Notes Due 2025 (1) | | 400 |
| | — |
| | — |
| 6.9% Notes Due 2026 | | 2 |
| | 2 |
| | 2 |
| 6.375% Senior Notes Due 2036 (1) | | 388 |
| | 388 |
| | 388 |
| 7.4% Debentures Due 2037 | | 313 |
| | 313 |
| | 313 |
| 7.625% Notes Due 2097 | | 500 |
| | 500 |
| | 500 |
| Total debt | | 4,238 |
| | 4,435 |
| | 4,063 |
| Unamortized debt issuance costs | | (54 | ) | | (62 | ) | | (51 | ) | Less: current maturities | | (42 | ) | | (307 | ) | | (232 | ) | Total long-term debt | | $ | 4,142 |
| | $ | 4,066 |
| | $ | 3,780 |
|
| | (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%. |
|