Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenues	$ 5,369	$ 5,735	$ 10,971	$ 11,182
Operating expenses:
Compensation and benefits	1,268	1,234	2,606	2,452
Fuel	697	1,156	1,410	2,315
Purchased services	628	634	1,276	1,287
Depreciation and amortization	489	523	985	1,038
Equipment rents	207	225	398	440
Materials and other	311	283	633	602
Total operating expenses	3,600	4,055	7,308	8,134
Operating income	1,769	1,680	3,663	3,048
Interest expense	228	206	445	402
Other expense, net	5	2	10	5
Income before income taxes	1,536	1,472	3,208	2,641
Income tax expense	573	556	1,200	1,001
Net income	$ 963	$ 916	$ 2,008	$ 1,640