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Consolidated Statements of Income (Unaudited) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Income Statement [Abstract]        
Railway operating revenues $ 3,343 $ 2,852 $ 9,508 $ 8,290
Railway operating expenses        
Compensation and benefits 735 609 1,968 1,844
Purchased services and rents 484 432 1,402 1,254
Fuel 383 208 1,092 573
Depreciation 306 297 912 883
Materials and other 163 170 506 418
Total railway operating expenses 2,071 1,716 5,880 4,972
Income from railway operations 1,272 1,136 3,628 3,318
Other income (expense) – net (2) 14 (21) 56
Interest expense on debt 177 164 515 481
Income before income taxes 1,093 986 3,092 2,893
Income taxes 135 233 612 648
Net income $ 958 $ 753 $ 2,480 $ 2,245
Earnings per share        
Basic (in dollars per share) $ 4.11 $ 3.07 $ 10.49 $ 9.03
Diluted (in dollars per share) $ 4.10 $ 3.06 $ 10.45 $ 8.99