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Condensed Consolidated Statements of Income (Unaudited) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Operating revenues [Abstract]        
Freight revenues $ 5,250 $ 5,019 $ 15,387 $ 14,755
Other revenues 323 324 946 921
Total operating revenues 5,573 5,343 16,333 15,676
Operating expenses [Abstract]        
Compensation and benefits 1,196 1,188 3,597 3,550
Fuel 866 880 2,629 2,688
Purchased services and materials 588 542 1,730 1,610
Depreciation 447 447 1,319 1,307
Equipment and other rents 309 300 924 895
Other 205 200 661 606
Total operating expenses 3,611 3,557 10,860 10,656
Operating income 1,962 1,786 5,473 5,020
Other income (Note 6) 28 28 91 65
Interest expense (138) (137) (399) (407)
Income before income taxes 1,852 1,677 5,165 4,678
Income taxes (701) (635) (1,951) (1,771)
Net income $ 1,151 $ 1,042 $ 3,214 $ 2,907
Share and Per Share (Note 8) [Abstract]        
Earnings per share - basic $ 2.49 $ 2.21 $ 6.91 $ 6.13
Earnings per share - diluted $ 2.48 $ 2.19 $ 6.88 $ 6.08
Weighted average number of shares - basic 461.7 472.0 465.0 474.5
Weighted average number of shares - diluted 464.2 475.2 467.4 477.9
Dividends declared per share $ 0.79 $ 0.60 $ 2.17 $ 1.80