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Condensed Consolidated Statements of Income (Unaudited) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Operating revenues:    
Operating revenues $ 6,056 $ 5,860
Operating expenses:    
Compensation and benefits 1,179 1,101
Fuel 766 714
Purchased services and materials 653 561
Depreciation 572 555
Equipment and other rents 235 215
Other 357 337
Total operating expenses 3,762 3,483
Operating income 2,294 2,377
Other income, net (Note 5) 184 47
Interest expense (336) (307)
Income before income taxes 2,142 2,117
Income tax expense (512) (487)
Net income $ 1,630 $ 1,630
Share and Per Share (Note 6):    
Earnings per share - basic (in dollars per share) $ 2.67 $ 2.58
Earnings per share - diluted (in dollars per share) $ 2.67 $ 2.57
Weighted average number of shares - basic (in shares) 610.6 632.2
Weighted average number of shares - diluted (in shares) 611.5 633.6
Cargo and Freight [Member]    
Operating revenues:    
Operating revenues $ 5,656 $ 5,440
Product and Service, Other [Member]    
Operating revenues:    
Operating revenues $ 400 $ 420