[["", "2018", "2017"], ["balance at january 1", "$ 280", "$ 278"], ["additions based on tax positions related to the current year", "18", "25"], ["additions for tax positions of prior years", "10", "12"], ["reductions for tax positions of prior years", "-24 ( 24 )", "-26 ( 26 )"], ["settlements", "2014", "-6 ( 6 )"], ["business combinations", "1", "2014"], ["lapse of statute of limitations", "-6 ( 6 )", "-7 ( 7 )"], ["foreign currency translation", "2014", "4"], ["balance at december 31", "$ 279", "$ 280"]]