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Consolidated Statements of Income - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Operating revenues:      
Operating revenues $ 24,875 $ 21,804 $ 19,533
Operating expenses:      
Compensation and benefits 4,645 4,158 3,993
Fuel 3,439 2,049 1,314
Purchased services and materials 2,442 2,016 1,962
Depreciation 2,246 2,208 2,210
Equipment and other rents 898 859 875
Other 1,288 1,176 1,345
Total operating expenses 14,958 12,466 11,699
Operating income 9,917 9,338 7,834
Other income, net (Note 6) 426 297 287
Interest expense (1,271) (1,157) (1,141)
Income before income taxes 9,072 8,478 6,980
Income tax expense (Note 7) (2,074) (1,955) (1,631)
Net income $ 6,998 $ 6,523 $ 5,349
Share and Per Share (Note 8):      
Earnings per share - basic (in dollars per share) $ 11.24 $ 9.98 $ 7.90
Earnings per share - diluted (in dollars per share) $ 11.21 $ 9.95 $ 7.88
Weighted average number of shares - basic (in shares) 622.7 653.8 677.3
Weighted average number of shares - diluted (in shares) 624.0 655.4 679.1
Cargo and Freight [Member]      
Operating revenues:      
Operating revenues $ 23,159 $ 20,244 $ 18,251
Product and Service, Other [Member]      
Operating revenues:      
Operating revenues $ 1,716 $ 1,560 $ 1,282