. these changes may be the result of settlements of ongoing audits . at this time , an estimate of the range of the reasonably possible outcomes within the twelve months cannot be made . the company recognizes interest and penalties related to uncertain tax positions in its provision for income taxes . the company accrued potential interest and penalties of $ 22 million , $ 11 million , and $ 15 million in 2018 , 2017 , and 2016 , respectively