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Consolidated Statements of Income (Unaudited) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Income Statement [Abstract]        
Railway operating revenues $ 2,980 $ 3,250 $ 6,112 $ 6,165
Railway operating expenses        
Compensation and benefits 693 614 1,383 1,233
Purchased services and rents 506 481 1,002 918
Fuel 263 408 578 709
Depreciation 321 304 642 606
Materials and other 205 172 417 343
Eastern Ohio incident 416 0 803 0
Total railway operating expenses 2,404 1,979 4,825 3,809
Income from railway operations 576 1,271 1,287 2,356
Other income (expense) – net 57 (14) 113 (19)
Interest expense on debt 170 170 345 338
Income before income taxes 463 1,087 1,055 1,999
Income taxes 107 268 233 477
Net income $ 356 $ 819 $ 822 $ 1,522
Earnings per share        
Basic (in dollars per share) $ 1.56 $ 3.46 $ 3.61 $ 6.39
Diluted (in dollars per share) $ 1.56 $ 3.45 $ 3.60 $ 6.37