Consolidated Statements of Income - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues, net	$ 2,151	$ 2,121	$ 1,988
Alternative revenue programs, net of amortization	(6)	2	3
Total Revenues	2,145	2,123	1,991
Operating expenses:
Purchased power and fuel	708	614	571
Generation, transmission and distribution	293	323	292
Administrative and other	283	290	271
Depreciation and amortization	454	409	382
Taxes other than income taxes	138	134	129
Total operating expenses	1,876	1,770	1,645
Income from operations	269	353	346
Interest expense, net	136	128	124
Other income:
Allowance for equity funds used during construction	16	10	11
Miscellaneous income, net	6	6	(4)
Other income, net	22	16	7
Income before income taxes	155	241	229
Income tax expense	0	27	17
Net income	$ 155	$ 214	$ 212
Weighted-average shares outstanding (in thousands):
Basic	89,485	89,353	89,215
Diluted	89,645	89,559	89,347
Earnings per share:
Basic	$ 1.73	$ 2.39	$ 2.38
Diluted	$ 1.72	$ 2.39	$ 2.37