the company 2019s liability for uncertain tax positions as of december 31 , 2018 , 2017 , and 2016 , includes $ 228 million , $ 219 million , and $ 240 million , respectively , related to amounts that would impact the effective tax rate if recognized . it is possible that the amount of unrecognized tax benefits may change in the next twelve months ; however , the company does not expect the change to have a significant impact on its consolidated statements of income or consolidated balance sheets