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Consolidated Statements of Income - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating revenues:      
Operating revenues $ 21,804 $ 19,533 $ 21,708
Operating expenses:      
Compensation and benefits 4,158 3,993 4,533
Depreciation 2,208 2,210 2,216
Fuel 2,049 1,314 2,107
Purchased services and materials 2,016 1,962 2,254
Equipment and other rents 859 875 984
Other 1,176 1,345 1,060
Total operating expenses 12,466 11,699 13,154
Operating income 9,338 7,834 8,554
Other income, net (Note 6) 297 287 243
Interest expense (1,157) (1,141) (1,050)
Income before income taxes 8,478 6,980 7,747
Income tax expense (Note 7) (1,955) (1,631) (1,828)
Net income $ 6,523 $ 5,349 $ 5,919
Share and Per Share (Note 8):      
Earnings per share - basic (in dollars per share) $ 9.98 $ 7.90 $ 8.41
Earnings per share - diluted (in dollars per share) $ 9.95 $ 7.88 $ 8.38
Weighted average number of shares - basic (in shares) 653.8 677.3 703.5
Weighted average number of shares - diluted (in shares) 655.4 679.1 706.1
Cargo and Freight [Member]      
Operating revenues:      
Operating revenues $ 20,244 $ 18,251 $ 20,243
Product and Service, Other [Member]      
Operating revenues:      
Operating revenues $ 1,560 $ 1,282 $ 1,465