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Consolidated Statements of Income - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Income Statement [Abstract]        
Railway operating revenues $ 2,799 $ 2,085 $ 5,438 $ 4,710
Railway operating expenses        
Compensation and benefits 624 586 1,235 1,208
Purchased services and rents 429 372 822 775
Fuel 188 84 365 273
Depreciation 294 282 586 574
Materials and other 97 151 248 317
Loss on asset disposal 0 0 0 385
Total railway operating expenses 1,632 1,475 3,256 3,532
Income from railway operations 1,167 610 2,182 1,178
Other income – net 35 49 42 71
Interest expense on debt 161 156 317 310
Income before income taxes 1,041 503 1,907 939
Income taxes 222 111 415 166
Net income $ 819 $ 392 $ 1,492 $ 773
Earnings per share        
Basic (in dollars per share) $ 3.29 $ 1.53 $ 5.96 $ 3.01
Diluted (in dollars per share) $ 3.28 $ 1.53 $ 5.94 $ 3.00