Consolidated Statements of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Railway operating revenues	$ 2,506	$ 2,841	$ 7,216	$ 8,606
Railway operating expenses:
Compensation and benefits	578	682	1,786	2,121
Purchased services and rents	486	423	1,261	1,265
Fuel	126	226	399	730
Depreciation	293	286	867	853
Materials and other	183	228	500	610
Loss on asset disposal	0	0	(385)	0
Total railway operating expenses	1,666	1,845	5,198	5,579
Income from railway operations	840	996	2,018	3,027
Other income – net	39	22	110	88
Interest expense on debt	155	150	465	452
Income before income taxes	724	868	1,663	2,663
Income taxes	155	211	321	607
Net income	$ 569	$ 657	$ 1,342	$ 2,056
Earnings per share:
Basic (in dollars per share)	$ 2.23	$ 2.50	$ 5.24	$ 7.76
Diluted (in dollars per share)	$ 2.22	$ 2.49	$ 5.21	$ 7.70