Consolidated Statements of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Railway operating revenues	$ 3,250	$ 2,799	$ 6,165	$ 5,438
Railway operating expenses
Compensation and benefits	614	624	1,233	1,235
Purchased services and rents	481	429	918	822
Fuel	408	188	709	365
Depreciation	304	294	606	586
Materials and other	172	97	343	248
Total railway operating expenses	1,979	1,632	3,809	3,256
Income from railway operations	1,271	1,167	2,356	2,182
Other income (expense) – net	(14)	35	(19)	42
Interest expense on debt	170	161	338	317
Income before income taxes	1,087	1,041	1,999	1,907
Income taxes	268	222	477	415
Net income	$ 819	$ 819	$ 1,522	$ 1,492
Earnings per share
Basic (in dollars per share)	$ 3.46	$ 3.29	$ 6.39	$ 5.96
Diluted (in dollars per share)	$ 3.45	$ 3.28	$ 6.37	$ 5.94