Consolidated Condensed Statements of Income and Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues
Electric	$ 461	$ 442
Gas	136	111
Total revenues	597	553
Expenses
Fuel	122	131
Purchased power	13	7
Cost of natural gas sold	55	36
Operations and maintenance	157	128
Depreciation and amortization	93	85
Taxes, other than income	52	49
Total expenses	492	436
Income from operations	105	117
Other income
Allowance for equity funds used during construction	0	1
Other income, net	2	2
Total other income	2	3
Interest charges
Interest on long-term debt	27	28
Other interest	3	2
Allowance for borrowed funds used during construction	0	(1)
Total interest charges	30	29
Income before provision for income taxes	77	91
Provision for income taxes	14	35
Net income	63	56
Comprehensive income	$ 63	$ 56