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Condensed Consolidated Statements of Income (Unaudited) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Operating revenues:    
Operating revenues $ 5,860 $ 5,001
Operating expenses:    
Compensation and benefits 1,101 1,026
Fuel 714 411
Purchased services and materials 561 490
Depreciation 555 549
Equipment and other rents 215 212
Other 337 320
Total operating expenses 3,483 3,008
Operating income 2,377 1,993
Other income, net (Note 6) 47 51
Interest expense (307) (290)
Income before income taxes 2,117 1,754
Income taxes (487) (413)
Net income $ 1,630 $ 1,341
Share and Per Share (Note 7):    
Earnings per share - basic (in dollars per share) $ 2.58 $ 2.01
Earnings per share - diluted (in dollars per share) $ 2.57 $ 2.00
Weighted average number of shares - basic (in shares) 632.2 667.6
Weighted average number of shares - diluted (in shares) 633.6 669.2
Cargo and Freight [Member]    
Operating revenues:    
Operating revenues $ 5,440 $ 4,649
Product and Service, Other [Member]    
Operating revenues:    
Operating revenues $ 420 $ 352