Consolidated Statements of Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Railway operating revenues	$ 11,142	$ 9,789	$ 11,296
Railway operating expenses
Compensation and benefits	2,442	2,373	2,751
Purchased services and rents	1,726	1,687	1,725
Fuel	799	535	953
Depreciation	1,181	1,154	1,138
Materials and other	547	653	740
Loss on asset disposal	0	385	0
Total railway operating expenses	6,695	6,787	7,307
Income from railway operations	4,447	3,002	3,989
Other income – net	77	153	106
Interest expense on debt	646	625	604
Income before income taxes	3,878	2,530	3,491
Income taxes	873	517	769
Net income	$ 3,005	$ 2,013	$ 2,722
Earnings per share
Basic (in dollars per share)	$ 12.16	$ 7.88	$ 10.32
Diluted (in dollars per share)	$ 12.11	$ 7.84	$ 10.25