Consolidated Statements of Income (Unaudited) (USD $) In Millions, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Consolidated Statements of Income
Railway operating revenues	$ 2,866	$ 2,430	$ 5,486	$ 4,668
Railway operating expenses:
Compensation and benefits	739	670	1,504	1,369
Purchased services and rents	405	374	788	709
Fuel	412	258	801	512
Depreciation	213	204	424	408
Materials and other	222	191	494	382
Total railway operating expenses	1,991	1,697	4,011	3,380
Income from railway operations	875	733	1,475	1,288
Other income, net	34	17	61	37
Interest expense on debt	113	115	225	234
Income before income taxes	796	635	1,311	1,091
Provision for income taxes	239	243	429	442
Net income	$ 557	$ 392	$ 882	$ 649
Per share amounts:
Basic	$ 1.58	$ 1.06	$ 2.49	$ 1.74
Diluted	$ 1.56	$ 1.04	$ 2.45	$ 1.72
Dividends	$ 0.40	$ 0.34	$ 0.80	$ 0.68