NEW YORK--(BUSINESS WIRE)--American Express Company (NYSE:AXP) today reported second-quarter net income of $1.47 billion, down from $1.53 billion a year ago. Diluted earnings per share decreased 1 percent to $1.42, from $1.43 a year ago.   (Millions, except percentages and per share amounts)           Quarters Ended June 30,     Percentage Inc/(Dec)     Six Months Ended June 30,     Percentage Inc/(Dec)           2015     2014           2015     2014       Total Revenues Net of Interest Expense