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Condensed Consolidated Statements of Income (Unaudited) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Operating revenues:        
Total operating revenues $ 6,244 $ 6,091 $ 18,425 $ 18,129
Operating expenses:        
Compensation and benefits 1,214 1,228 3,675 3,638
Purchased services and materials 683 644 1,956 1,901
Depreciation 618 602 1,841 1,792
Fuel 616 610 1,795 1,893
Equipment and other rents 212 237 683 672
Other 352 354 1,030 1,045
Total operating expenses 3,695 3,675 10,980 10,941
Operating income 2,549 2,416 7,445 7,188
Other income, net (Note 6) 96 87 297 282
Interest expense (327) (314) (984) (957)
Income before income taxes 2,318 2,189 6,758 6,513
Income tax expense (Note 7) (530) (518) (1,468) (1,528)
Net income $ 1,788 $ 1,671 $ 5,290 $ 4,985
Share and per share (Note 8):        
Earnings per share - basic (in dollars per share) $ 3.02 $ 2.75 $ 8.88 $ 8.19
Earnings per share - diluted (in dollars per share) $ 3.01 $ 2.75 $ 8.87 $ 8.18
Weighted average number of shares - basic (in shares) 592.4 607.6 595.8 608.7
Weighted average number of shares - diluted (in shares) 593.2 608.6 596.7 609.7
Freight revenues        
Operating revenues:        
Total operating revenues $ 5,927 $ 5,768 $ 17,461 $ 17,022
Other revenues        
Operating revenues:        
Total operating revenues $ 317 $ 323 $ 964 $ 1,107