Consolidated Statements of Income (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues	$ 5,881	$ 5,651	$ 17,063	$ 16,257
Operating expenses:
Compensation and benefits	1,243	1,197	3,695	3,464
Fuel	1,123	1,145	3,438	3,343
Purchased services	637	618	1,924	1,852
Depreciation and amortization	531	493	1,569	1,465
Equipment rents	216	205	656	608
Materials and other	263	253	865	740
Total operating expenses	4,013	3,911	12,147	11,472
Operating income	1,868	1,740	4,916	4,785
Interest expense	211	181	613	536
Other expense, net	3	3	8	7
Income before income taxes	1,654	1,556	4,295	4,242
Income tax expense	619	567	1,620	1,571
Net income	$ 1,035	$ 989	$ 2,675	$ 2,671