Statements of Operations - MEC - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating revenue:
Total operating revenue	$ 26,337	$ 25,150	$ 20,952
Operating expenses:
Cost of fuel and energy	6,757	5,504	4,187
Total operating expenses	21,096	19,823	16,661
Operating income	5,241	5,327	4,291
Other income (expense):
Interest expense	(2,216)	(2,118)	(2,021)
Allowance for equity funds	167	126	165
Other, net	(7)	(17)	88
Total other income (expense)	(3,828)	(33)	3,180
Income (loss) before income tax expense (benefit) and equity income (loss)	1,413	5,294	7,471
Income tax (benefit) expense	(1,916)	(1,132)	308
Net income (loss) attributable to parent	2,721	5,790	6,943
MEC
Operating revenue:
Total operating revenue	4,025	3,547	2,720
Operating expenses:
Operations and maintenance	828	775	754
Depreciation and amortization	1,168	914	716
Property and other taxes	149	142	135
Total operating expenses	3,587	3,131	2,272
Operating income	438	416	448
Other income (expense):
Interest expense	(313)	(302)	(304)
Allowance for borrowed funds	15	13	15
Allowance for equity funds	51	39	45
Other, net	0	53	52
Total other income (expense)	(247)	(197)	(192)
Income (loss) before income tax expense (benefit) and equity income (loss)	191	219	256
Income tax (benefit) expense	(770)	(675)	(570)
Net income (loss) attributable to parent	961	894	826
Regulated electric | MEC
Operating revenue:
Total operating revenue	2,988	2,529	2,139
Operating expenses:
Cost of fuel and energy	679	539	339
Regulated natural gas and other | MEC
Operating revenue:
Total operating revenue	1,037	1,018	581
Operating expenses:
Cost of fuel and energy	$ 763	$ 761	$ 328