Statements of Operations (Unaudited) - MEC - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating revenue:
Total operating revenue	$ 6,030	$ 6,081
Operating expenses:
Cost of sales	1,460	1,569
Total operating expenses	4,794	4,748
Operating income	1,236	1,333
Other income (expense):
Interest expense	(532)	(530)
Allowance for equity funds	38	26
Other, net	5	8
Total other income (expense)	(1,706)	(1,579)
Income (loss) before income tax expense (benefit) and equity income (loss)	(470)	(246)
Income tax benefit	(507)	(535)
Net income (loss) attributable to parent	(129)	4
MEC
Operating revenue:
Total operating revenue	1,005	1,067
Operating expenses:
Operations and maintenance	192	193
Depreciation and amortization	250	207
Property and other taxes	40	36
Total operating expenses	905	1,019
Operating income	100	48
Other income (expense):
Interest expense	(78)	(74)
Allowance for borrowed funds	4	2
Allowance for equity funds	15	6
Other, net	(3)	11
Total other income (expense)	(62)	(55)
Income (loss) before income tax expense (benefit) and equity income (loss)	38	(7)
Income tax benefit	(206)	(154)
Net income (loss) attributable to parent	244	147
Regulated electric | MEC
Operating revenue:
Total operating revenue	608	545
Operating expenses:
Cost of sales	125	151
Regulated natural gas and other | MEC
Operating revenue:
Total operating revenue	397	522
Operating expenses:
Cost of sales	$ 298	$ 432