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Condensed Consolidated Statements of Income (Unaudited) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Operating revenues:        
Operating revenues $ 5,963 $ 6,269 $ 12,019 $ 12,129
Operating expenses:        
Compensation and benefits 1,269 1,092 2,448 2,193
Fuel 664 940 1,430 1,654
Purchased services and materials 650 622 1,303 1,183
Depreciation 577 559 1,149 1,114
Equipment and other rents 248 230 483 445
Other 351 331 708 668
Total operating expenses 3,759 3,774 7,521 7,257
Operating income 2,204 2,495 4,498 4,872
Other income, net (Note 5) 93 163 277 210
Interest expense (339) (316) (675) (623)
Income before income taxes 1,958 2,342 4,100 4,459
Income tax expense (Note 6) (389) (507) (901) (994)
Net income $ 1,569 $ 1,835 $ 3,199 $ 3,465
Share and Per Share (Note 7):        
Earnings per share - basic (in dollars per share) $ 2.58 $ 2.93 $ 5.25 $ 5.51
Earnings per share - diluted (in dollars per share) $ 2.57 $ 2.93 $ 5.24 $ 5.50
Weighted average number of shares - basic (in shares) 608.7 625.6 609.6 628.9
Weighted average number of shares - diluted (in shares) 609.5 626.8 610.5 630.2
Cargo and Freight [Member]        
Operating revenues:        
Operating revenues $ 5,569 $ 5,842 $ 11,225 $ 11,282
Product and Service, Other [Member]        
Operating revenues:        
Operating revenues $ 394 $ 427 $ 794 $ 847