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Condensed Consolidated Statements of Income - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Operating revenues:        
Revenue from contract with customer excluding assessed tax $ 4,596 $ 5,146 $ 13,448 $ 15,392
Total operating revenues 4,919 5,516 14,392 16,496
Operating expenses:        
Compensation and benefits 1,008 1,134 2,972 3,484
Depreciation 555 557 1,653 1,657
Purchased services and materials 508 574 1,470 1,723
Fuel 301 504 982 1,595
Equipment and other rents 217 236 655 754
Other 299 277 832 829
Total operating expenses 2,888 3,282 8,564 10,042
Operating income 2,031 2,234 5,828 6,454
Other income (Note 6) 37 53 221 187
Interest expense (295) (266) (862) (772)
Income before income taxes 1,773 2,021 5,187 5,869
Income taxes (410) (466) (1,218) (1,353)
Net income $ 1,363 $ 1,555 $ 3,969 $ 4,516
Share and Per Share (Note 8):        
Earnings per share - basic $ 2.02 $ 2.22 $ 5.85 $ 6.39
Earnings per share - diluted $ 2.01 $ 2.22 $ 5.83 $ 6.36
Weighted average number of shares - basic 675.0 699.3 679.0 707.2
Weighted average number of shares - diluted 676.8 701.9 680.7 709.8
Cargo and Freight [Member]        
Operating revenues:        
Revenue from contract with customer excluding assessed tax $ 4,596 $ 5,146 $ 13,448 $ 15,392
Other [Member]        
Operating revenues:        
Revenue from contract with customer excluding assessed tax $ 323 $ 370 $ 944 $ 1,104