Other indebtedness includes borrowings from various financial institutions and capital lease obligations. Senior notes  — In December 2014, we completed the sale of $425 in senior unsecured notes. Interest on the December 2024  Notes is payable on June 15 and December 15 of each year beginning on June 15, 2015. Net proceeds of the of fering totaled  $418. Financing costs of $7 were recorded as deferred costs and are being amortized to interest expense over the life of the  notes. The proceeds from the offering are being used to redeem our February 2019 Notes. See senior notes redemption  discussion below. We may redeem some or all of the December 2024 Notes at the following redemption prices (expressed as percentages of  principal amount), plus accrued and unpaid interest to the redemption date, if redeemed during the 12-month period  commencing on December 15 of the years set forth below: Prior to December 15, 2019, we may redeem some or all of the December 2024 Notes at a price equal to the principal  amount thereof, plus accrued and unpaid interest, plus a “make-whole” premium.  We have not separated the make-whole  premium from the underlying debt instrument to account for it as a derivative instrument as the economic characteristics and  the risks of this embedded derivative are clearly and closely related to the economic characteristics and risks of the underlying  debt. At any time prior to December 15, 2017, we may redeem up to 35% of the original aggregate principal amount of the  December 2024 Notes in an amount not to exceed the amount of proceeds of one or more equity of ferings, at a price equal to  105.500% of the principal amount of such notes, plus accrued and unpaid interest thereon, provided that at least  50% of the  original aggregate principal amount of the December 2024 Notes remains outstanding after giving ef fect to any such  redemption. In July 2013, we completed the sale of $750 in senior unsecured notes. Interest on the September 2021 Notes and  September 2023 Notes is payable on March 15 and September 15 of each year beginning on March 15, 2014. Net proceeds of  the offering totaled $734. Financing costs of $16 were recorded as deferred costs and are being amortized to interest expense  70 Redemption Price December Year 2024 Notes 2019 102.750% 2020 101.833% 2021 100.917% 2022 100.000% 2023 100.000% Scheduled principal payments on long-term debt as of December 31, 2014  — 2015 2016 2017 2018 2019 Thereafter Total Debt maturities $ 46 $ 42 $ 21 $ 5 $ 17 $ 1,528 $ 1,659 Long-term debt at December 31  — Interest Rate 2014 2013  Senior Notes due February 15, 2019 6.500% $ 55 $ 400  Senior Notes due February 15, 2021 6.750% 350 350  Senior Notes due September 15, 2021 5.375% 450 450  Senior Notes due September 15, 2023 6.000% 300 300  Senior Notes due December 15, 2024 5.500% 425  Other indebtedness 79 99  Total 1,659 1,599  Less: current maturities 46 32  Total long-term debt $ 1,613 $ 1,567 Note 13. Financing Agreements