.8 billion and $ 26.5 billion of margin loans at december 31 , 2014 and 2013 , respectively , to prime and retail brokerage customers ; these are classified in accrued interest and accounts receivable on the consolidated balance sheets . ( b ) includes unused advised lines of credit of $ 105.2 billion and $ 102.0 billion as of december 31 , 2014 and 2013 , respectively