debt issuance costs : debt issuance costs are reflected as a direct deduction of our long-term debt balance on the consolidated balance sheets . we incurred debt issuance costs of $ 15 million in 2018 and $ 53 million in 2016 . debt issuance costs in 2017 were insignificant . unamortized debt issuance costs were $ 115 million at december 29 , 2018 , $ 114 million at december 30 , 2017 , and $ 124 million at december 31 , 2016