[["$ in millions", "for the three months ended or as of december 2017", "for the three months ended or as of december 2016"], ["tier 1 capital", "$ 78227", "$ 81808"], ["average total assets", "$ 937424", "$ 883515"], ["deductions from tier 1 capital", "-4572 ( 4572 )", "-4897 ( 4897 )"], ["average adjusted total assets", "932852", "878618"], ["off-balance-sheetexposures", "408164", "391555"], ["total supplementary leverage exposure", "$ 1341016", "$ 1270173"], ["supplementary leverage ratio", "5.8% ( 5