Supplemental cash flow information (Tables)

6 Months Ended

Jun. 30, 2019

Supplemental Cash Flow Elements [Abstract]

Schedule of supplemental cash flow information

A summary of supplemental cash flow information is presented in the following table (in millions).

	First Six Months
	2019		2018
Cash paid during the period for:
Income taxes	$	1,199	$	2,358
Interest:
Insurance and other		540		646
Railroad, utilities and energy		1,370		1,402
Non-cash investing and financing activities:
Liabilities assumed in connection with business acquisitions		94		76
Right-of-use assets obtained in exchange for new operating lease liabilities		361		—