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Supplemental cash flow information
 12 Months Ended
Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract]  
Supplemental cash flow information
(14)

Supplemental cash flow information

A summary of supplemental cash flow information for each of the three years ending December 31, 2018 is presented in the following table (in millions).

 

     2018           2017           2016  

Cash paid during the period for:

         

Income taxes

    $ 4,354      $ 3,286      $ 4,719  

Interest:

         

Insurance and other

      1,111        1,260        944  

Railroad, utilities and energy

      2,867        2,828        2,788  

Non-cash investing and financing activities:

         

Liabilities assumed in connection with business acquisitions

      3,735        747        16,555  

Equity securities exchanged in connection with business acquisitions

      —          —          4,239  

Conversions and other exchanges of investments

      —          —          4,154  

Equity securities surrendered in connection with warrant exercise

      —          4,965        —