[["( millions )", "2008", "2007"], ["balance at january 1", "$ 110", "$ 77"], ["additions based on tax positions related to the current year", "12", "21"], ["additions for tax positions of prior years", "5", "19"], ["reductions for tax positions of prior years", "-17 ( 17 )", "-5 ( 5 )"], ["pre-acquisition unrecognized tax benefits", "20", "2014"], ["reductions for expiration of the applicable statute of limitations", "-6 ( 6 )", "-5 ( 5 )"], ["settlements", "-21 ( 21 )", "-1 ( 1 )"], ["currency", "-4 ( 4