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Supplemental cash flow information (Tables)
 9 Months Ended
Sep. 30, 2015
Supplemental Cash Flow Elements [Abstract]  
Schedule of supplemental cash flow information

A summary of supplemental cash flow information for the first nine months of 2015 and 2014 is presented in the following table (in millions).

 

             First Nine Months        
     2015      2014

Cash paid during the period for:

            

Income taxes

        $  2,575                $  3,201  

Interest:

            

Insurance and other businesses

        312            321  

Railroad, utilities and energy businesses

        2,043            1,864  

Finance and financial products businesses

        274            332  

Non-cash investing and financing activities:

            

Equity securities exchanged in connection with business acquisitions

        —            2,478  

Liabilities assumed in connection with business acquisitions

        2,792            1,459  

Treasury stock acquired in connection with business acquisition

        —            400