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Condensed Consolidated Statements of Income (Unaudited) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Operating revenues:        
Operating revenues $ 5,941 $ 6,566 $ 17,960 $ 18,695
Operating expenses:        
Compensation and benefits 1,201 1,278 3,649 3,471
Fuel 702 932 2,132 2,586
Purchased services and materials 668 626 1,971 1,809
Depreciation 580 563 1,729 1,677
Equipment and other rents 235 215 718 660
Other 378 319 1,086 987
Total operating expenses 3,764 3,933 11,285 11,190
Operating income 2,177 2,633 6,675 7,505
Other income, net (Note 5) 106 124 383 334
Interest expense (334) (315) (1,009) (938)
Income before income taxes 1,949 2,442 6,049 6,901
Income tax expense (Note 6) (421) (547) (1,322) (1,541)
Net income $ 1,528 $ 1,895 $ 4,727 $ 5,360
Share and Per Share (Note 7):        
Earnings per share - basic (in dollars per share) $ 2.51 $ 3.05 $ 7.76 $ 8.56
Earnings per share - diluted (in dollars per share) $ 2.51 $ 3.05 $ 7.75 $ 8.54
Weighted average number of shares - basic (in shares) 608.7 620.4 609.3 626.1
Weighted average number of shares - diluted (in shares) 609.8 621.5 610.3 627.4
Cargo and Freight [Member]        
Operating revenues:        
Operating revenues $ 5,545 $ 6,109 $ 16,770 $ 17,391
Product and Service, Other [Member]        
Operating revenues:        
Operating revenues $ 396 $ 457 $ 1,190 $ 1,304