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Segment Reporting - Schedule of Cost and Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting [Abstract]
Railway operating revenues	$ 2,993	$ 3,004
Railway operating expenses
Compensation and benefits	739	736
Purchased services	401	420
Equipment rents	97	108
Fuel	244	284
Depreciation	346	337
Materials	100	98
Claims	66	48
Other	39	69
Restructuring and other charges	0	99
Eastern Ohio incident		592
Total railway operating expenses	1,847	2,791
Income from railway operations	1,146	213
Other income – net	31	18
Interest expense on debt	199	201
Income before income taxes	978	30
Income taxes	228	(23)
Net income	$ 750	$ 53

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