Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Railway operating revenues	$ 2,085	$ 2,925	$ 4,710	$ 5,765
Railway operating expenses:
Compensation and benefits	586	712	1,208	1,439
Purchased services and rents	372	418	775	842
Fuel	84	254	273	504
Depreciation	282	284	574	567
Materials and other	151	192	317	382
Loss on asset disposal	0	0	(385)	0
Total railway operating expenses	1,475	1,860	3,532	3,734
Income from railway operations	610	1,065	1,178	2,031
Other income – net	49	22	71	66
Interest expense on debt	156	153	310	302
Income before income taxes	503	934	939	1,795
Income taxes	111	212	166	396
Net income	$ 392	$ 722	$ 773	$ 1,399
Earnings per share:
Basic (in dollars per share)	$ 1.53	$ 2.72	$ 3.01	$ 5.25
Diluted (in dollars per share)	$ 1.53	$ 2.70	$ 3.00	$ 5.21