Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues	$ 5,762	$ 5,624
Operating expenses:
Compensation and benefits	1,400	1,315
Purchased services	713	692
Fuel	711	767
Depreciation and amortization	591	571
Equipment rents	191	192
Materials and other	377	340
Total operating expenses	3,983	3,877
Operating income	1,779	1,747
Interest expense	268	256
Other (income) expense, net	(154)	(22)
Income before income taxes	1,665	1,513
Income tax expense	412	368
Net income	$ 1,253	$ 1,145