. amortization of debt issuance costs was $ 16 million in 2018 , $ 16 million in 2017 , and $ 14 million in 2016 . debt premium : unamortized debt premiums are presented on the consolidated balance sheets as a direct addition to the carrying amount of debt . unamortized debt premium , net , was $ 430 million at december 29 , 2018 and $ 505 million at december 30 , 2017 . amortization of our debt premium , net , was $ 65 million in 2018 , $ 81 million in 2017 , and $ 88 million in 2016