Segment Reporting - Schedule of Cost and Expense (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting [Abstract]
Railway operating revenues	$ 3,110		$ 3,044		$ 6,103	$ 6,048
Railway operating expenses
Compensation and benefits	692		700		1,431	1,436
Purchased services	409		419		810	839
Equipment rents	111		97		208	205
Fuel	219		257		463	541
Depreciation	346		335		692	672
Materials	98		92		198	190
Claims	59		50		125	98
Other	38		31		77	100
Restructuring and other charges	10		(3)		10	96
Eastern Ohio incident	47		65		232
Eastern Ohio incident						527
Total railway operating expenses	1,935		1,913		3,782	4,704
Income from railway operations	1,175		1,131		2,321	1,344
Other income – net	24		17		55	35
Interest expense on debt	201		204		400	405
Income before income taxes	998		944		1,976	974
Income taxes	230		207		458	184
Net income	$ 768	$ 750	$ 737	$ 53	$ 1,518	$ 790

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