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Consolidated Statements of Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Statement [Abstract]      
Railway operating revenues $ 9,789 $ 11,296 $ 11,458
Railway operating expenses:      
Compensation and benefits 2,373 2,751 2,925
Purchased services and rents 1,687 1,725 1,730
Fuel 535 953 1,087
Depreciation 1,154 1,138 1,102
Materials and other 653 740 655
Loss on asset disposal 385 0 0
Total railway operating expenses 6,787 7,307 7,499
Income from railway operations 3,002 3,989 3,959
Other income – net 153 106 67
Interest expense on debt 625 604 557
Income before income taxes 2,530 3,491 3,469
Income taxes 517 769 803
Net income $ 2,013 $ 2,722 $ 2,666
Earnings per share:      
Basic (in dollars per share) $ 7.88 $ 10.32 $ 9.58
Diluted (in dollars per share) $ 7.84 $ 10.25 $ 9.51