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Consolidated Statements Of Income - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating revenues:      
Total operating revenues $ 19,533 $ 21,708 $ 22,832
Operating expenses:      
Compensation and benefits 3,993 4,533 5,056
Depreciation 2,210 2,216 2,191
Purchased services and materials 1,962 2,254 2,443
Fuel 1,314 2,107 2,531
Equipment and other rents 875 984 1,072
Other 1,345 1,060 1,022
Total operating expenses 11,699 13,154 14,315
Operating income 7,834 8,554 8,517
Other income (Note 6) 287 243 94
Interest expense (1,141) (1,050) (870)
Income before income taxes 6,980 7,747 7,741
Income taxes (Note 7) (1,631) (1,828) (1,775)
Net income $ 5,349 $ 5,919 $ 5,966
Share and Per Share (Note 8):      
Earnings per share - basic $ 7.90 $ 8.41 $ 7.95
Earnings per share - diluted $ 7.88 $ 8.38 $ 7.91
Weighted average number of shares - basic 677.3 703.5 750.9
Weighted average number of shares - diluted 679.1 706.1 754.3
Cargo and Freight [Member]      
Operating revenues:      
Revenue from contract with customer excluding assessed tax $ 18,251 $ 20,243 $ 21,384
Other [Member]      
Operating revenues:      
Revenue from contract with customer excluding assessed tax $ 1,282 $ 1,465 $ 1,448