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Supplemental cash flow information
 12 Months Ended
Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract]  
Supplemental cash flow information
(12) Supplemental cash flow information

A summary of supplemental cash flow information for each of the three years ending December 31, 2017 is presented in the following table (in millions).

 

       2017        2016        2015  

Cash paid during the period for:

               

Income taxes

      $ 3,286        $ 4,719        $ 4,535  

Interest:

               

Insurance and other businesses

        871          555          346  

Railroad, utilities and energy businesses

        2,828          2,788          2,717  

Finance and financial products businesses

        389          389          403  

Non-cash investing and financing activities:

               

Liabilities assumed in connection with business acquisitions

        747          16,555          2,812  

Equity securities exchanged in connection with business acquisitions

        —            4,239          —    

Conversions and other exchanges of investments

        —            4,154          1,597  

Equity securities surrendered in connection with warrant exercise

        4,965          —            —