2013 | 2012 | 2011 | |||||||||
(millions) | |||||||||||
7.625% Senior debentures due 2013 | $ | 109 | $ | — | $ | — | |||||
5.35% Senior notes due 2012 | — | 616 | — | ||||||||
5.90% Senior notes due 2016 | — | 400 | — | ||||||||
5.875% Senior notes due 2013 | — | 298 | — | ||||||||
7.875% Senior notes due 2015 | — | 205 | — | ||||||||
8.0% Senior debentures due 2012 | — | 173 | — | ||||||||
7.45% Senior debentures due 2016 | — | 64 | — | ||||||||
7.5% Senior debentures due 2015 | — | 31 | — | ||||||||
6.625% Senior notes due 2011 | — | — | 330 | ||||||||
7.45% Senior debentures due 2011 | — | — | 109 | ||||||||
9.5% amortizing debentures due 2021 | 4 | 4 | 4 | ||||||||
9.75% amortizing debentures due 2021 | 2 | 2 | 2 | ||||||||
Capital leases and other obligations | 9 | 10 | 9 | ||||||||
$ | 124 | $ | 1,803 | $ | 454 | ||||||