[["( in millions )", "2015", "2014", "2013"], ["balance january 1", "$ 1171", "$ 1701", "$ 1573"], ["additions based on tax positions related to the current year", "67", "63", "90"], ["additions based on tax positions related to prior years", "98", "111", "201"], ["additions from acquired subsidiaries", "2014", "2014", "268"], ["reductions for tax positions of prior years", "-84 ( 84 )", "-220 ( 220 )", "-141 ( 141 )"], ["reductions due to expiration of statutes of limitations", "-41 ( 41 )", "-448 ( 448