Statements of Operations (Unaudited) - MEC - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Operating revenue:
Total operating revenue	$ 6,968	$ 6,193	$ 19,113	$ 15,332
Operating expenses:
Cost of sales	1,385	1,169	4,064	3,095
Total operating expenses	5,134	4,646	14,738	11,930
Operating income	1,834	1,547	4,375	3,402
Other income (expense):
Interest expense	(531)	(504)	(1,593)	(1,490)
Allowance for equity funds	34	50	90	122
Other, net	8	36	64	61
Total other income (expense)	(159)	1,420	(186)	1,217
Income (loss) before income tax expense (benefit) and equity income (loss)	1,675	2,967	4,189	4,619
Income tax (benefit) expense	(355)	80	(563)	(111)
Net income (loss) attributable to parent	1,922	2,842	4,207	4,628
MEC
Operating revenue:
Total operating revenue	966	812	2,726	2,106
Operating expenses:
Operations and maintenance	200	212	577	559
Depreciation and amortization	218	180	634	531
Property and other taxes	34	33	107	102
Total operating expenses	679	580	2,288	1,668
Operating income	287	232	438	438
Other income (expense):
Interest expense	(76)	(74)	(224)	(224)
Allowance for borrowed funds	4	5	8	12
Allowance for equity funds	11	16	25	33
Other, net	8	14	34	30
Total other income (expense)	(53)	(39)	(157)	(149)
Income (loss) before income tax expense (benefit) and equity income (loss)	234	193	281	289
Income tax (benefit) expense	(143)	(147)	(456)	(411)
Net income (loss) attributable to parent	377	340	737	700
Regulated electric | MEC
Operating revenue:
Total operating revenue	854	728	1,985	1,717
Operating expenses:
Cost of sales	163	115	417	266
Regulated natural gas and other | MEC
Operating revenue:
Total operating revenue	112	84	741	389
Operating expenses:
Cost of sales	$ 64	$ 40	$ 553	$ 210