CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating revenues
Electric	$ 3,116	$ 3,033	$ 3,031
Natural gas	1,024	1,161	1,015
Other	43	43	40
Total operating revenues	4,183	4,237	4,086
Operating expenses
Electric fuel and purchased power	1,132	1,083	1,157
Cost of natural gas sold and transported	374	526	428
Cost of sales — steam and other	13	17	15
Operating and maintenance expenses	811	810	788
Demand side management expenses	141	136	142
Depreciation and amortization	655	602	561
Taxes (other than income taxes)	234	206	202
Total operating expenses	3,360	3,380	3,293
Operating income	823	857	793
Other (expense) income, net	(1)	3	2
Allowance for funds used during construction — equity	35	22	56
Interest charges and financing costs
Interest charges — includes other financing costs of $7, $7 and $7, respectively	(238)	(235)	(208)
Allowance for funds used during construction — debt	(14)	(11)	(22)
Total interest charges and financing costs	224	224	186
Income before income taxes	633	658	665
Income tax expense	45	80	113
Net income	$ 588	$ 578	$ 552