. for additional information on these fees and commissions , see the segment discussions of ccb on pages 81 201391 , am on pages 100 2013102 , and note 7 . securities gains decreased compared with the prior year , reflecting lower repositioning activity related to the firm 2019s investment securities portfolio . for additional information , see the corporate segment discussion on pages 103 2013104 and note 12 . mortgage fees and related income decreased compared with the prior year