Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenues	$ 5,185	$ 4,767
Operating expenses:
Compensation and benefits	1,283	1,208
Purchased services	626	638
Fuel	605	395
Depreciation and amortization	573	520
Equipment rents	196	188
Materials and other	308	313
Total operating expenses	3,591	3,262
Operating income	1,594	1,505
Interest expense	252	245
Other (income) expense, net	(3)	2
Income before income taxes	1,345	1,258
Income tax expense	507	474
Net income	$ 838	$ 784