CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating revenues
Electric, non-affiliates	$ 4,593	$ 4,131	$ 4,049
Electric, affiliates	501	440	457
Natural gas	623	493	571
Other	39	37	35
Total operating revenues	5,756	5,101	5,112
Operating expenses
Electric fuel and purchased power	2,042	1,626	1,601
Cost of natural gas sold and transported	385	263	327
Cost of sales — other	23	22	23
Operating and maintenance expenses	1,190	1,191	1,203
Conservation program expenses	144	119	120
Depreciation and amortization	926	825	791
Taxes (other than income taxes)	264	259	260
Total operating expenses	4,974	4,305	4,325
Operating income	782	796	787
Other income (expense), net	4	2	(1)
Allowance for funds used during construction — equity	30	25	25
Interest charges and financing costs
Interest charges — includes other financing costs of $8, $8 and $7, respectively	271	249	233
Allowance for funds used during construction — debt	(13)	(11)	(12)
Total interest charges and financing costs	258	238	221
Income before income taxes	558	585	590
Income tax (benefit) expense	(48)	(6)	47
Net income	$ 606	$ 591	$ 543