Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues, net	$ 515	$ 484	$ 1,494	$ 1,399
Operating expenses:
Purchased power and fuel	184	180	443	455
Generation, transmission and distribution	73	69	235	199
Administrative and other	64	63	197	185
Depreciation and amortization	87	79	257	244
Taxes other than income taxes	30	29	94	89
Total operating expenses	438	420	1,226	1,172
Income from operations	77	64	268	227
Interest expense, net	30	28	90	82
Other income:
Allowance for equity funds used during construction	4	4	9	19
Miscellaneous income, net	2	0	4	0
Other income, net	6	4	13	19
Income before income tax expense	53	40	191	164
Income tax expense	13	6	46	32
Net income and Comprehensive income	$ 40	$ 34	$ 145	$ 132
Weighted-average shares outstanding-basic and diluted (in thousands)	89,065	88,921	89,044	88,885
Earnings per share-basic and diluted	$ 0.44	$ 0.38	$ 1.62	$ 1.49
Dividends declared per common share	$ 0.34	$ 0.32	$ 1.00	$ 0.94