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Summary of Significant Accounting Policies - Schedule of Cost and Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Accounting Policies [Abstract]      
Railway operating revenues $ 12,123 $ 12,156 $ 12,745
Railway operating expenses      
Compensation and benefits 2,823 2,819 2,621
Purchased services and rents 1,655 1,683 1,565
Equipment rents 393 387 357
Fuel 987 1,170 1,459
Depreciation 1,353 1,298 1,221
Materials and other 369 364 283
Claims 237 242 270
Other 273 226 160
Restructuring and other charges 183 0 0
Eastern Ohio incident 325 1,116 0
Total railway operating expenses 8,052 9,305 7,936
Income from railway operations 4,071 2,851 4,809
Other income – net (Note 4) 65 191 13
Interest expense on debt 807 722 692
Income before income taxes 3,329 2,320 4,130
Income taxes 707 493 860
Net income $ 2,622 $ 1,827 $ 3,270