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Condensed Consolidated Statements of Income (Unaudited) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Operating revenues [Abstract]        
Freight revenues $ 5,661 $ 5,153 $ 10,947 $ 10,137
Other revenues 354 317 706 623
Total operating revenues 6,015 5,470 11,653 10,760
Operating expenses [Abstract]        
Compensation and benefits 1,246 1,185 2,500 2,401
Fuel 923 863 1,844 1,763
Purchased services and materials 636 585 1,243 1,142
Depreciation 470 438 934 872
Equipment and other rents 316 302 628 615
Other 228 219 454 456
Total operating expenses 3,819 3,592 7,603 7,249
Operating income 2,196 1,878 4,050 3,511
Other income (Note 7) 22 23 60 63
Interest expense (138) (133) (271) (261)
Income before income taxes 2,080 1,768 3,839 3,313
Income taxes (789) (662) (1,460) (1,250)
Net income $ 1,291 $ 1,106 $ 2,379 $ 2,063
Share and Per Share (Notes 4 and 9) [Abstract]        
Earnings per share - basic $ 1.43 $ 1.19 $ 2.63 $ 2.21
Earnings per share - diluted $ 1.43 $ 1.18 $ 2.62 $ 2.20
Weighted average number of shares - basic 901.5 930.6 904.8 933.1
Weighted average number of shares - diluted 905.0 935.3 908.7 938.1
Dividends declared per share $ 0.455 $ 0.345 $ 0.91 $ 0.69