CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating revenues
Electric, non-affiliates	$ 1,024	$ 925
Electric, affiliates	115	110
Natural gas	204	206
Other	9	9
Total operating revenues	1,352	1,250
Operating expenses
Electric fuel and purchased power	433	364
Cost of natural gas sold and transported	125	125
Cost of sales — other	5	6
Operating and maintenance expenses	298	296
Conservation program expenses	34	31
Depreciation and amortization	221	202
Taxes (other than income taxes)	69	69
Total operating expenses	1,185	1,093
Operating income	167	157
Other income (expense), net	2	(5)
Allowance for funds used during construction — equity	7	7
Interest charges and financing costs
Interest charges — includes other financing costs of $2 and $2, respectively	63	61
Allowance for funds used during construction — debt	(3)	(3)
Total interest charges and financing costs	60	58
Income before income taxes	116	101
Income tax benefit	(12)	(6)
Net income	$ 128	$ 107