Statements of Operations (Unaudited) - MEC - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Operating revenue:
Total operating revenue	$ 6,064	$ 4,612	$ 12,145	$ 9,139
Operating expenses:
Cost of sales	1,110	888	2,679	1,926
Total operating expenses	4,856	3,676	9,604	7,284
Operating income	1,208	936	2,541	1,855
Other income (expense):
Interest expense	(532)	(503)	(1,062)	(986)
Allowance for equity funds	30	38	56	72
Other, net	48	52	56	25
Total other income (expense)	1,552	209	(27)	(203)
Income (loss) before income tax expense (benefit) and equity income (loss)	2,760	1,145	2,514	1,652
Income tax expense (benefit)	327	(7)	(208)	(191)
Net income (loss) attributable to parent	2,281	1,116	2,285	1,786
MEC
Operating revenue:
Total operating revenue	693	613	1,760	1,294
Operating expenses:
Operations and maintenance	184	182	377	347
Depreciation and amortization	209	175	416	351
Property and other taxes	37	35	73	69
Total operating expenses	590	505	1,609	1,088
Operating income	103	108	151	206
Other income (expense):
Interest expense	(74)	(74)	(148)	(150)
Allowance for borrowed funds	2	4	4	7
Allowance for equity funds	8	9	14	17
Other, net	15	21	26	16
Total other income (expense)	(49)	(40)	(104)	(110)
Income (loss) before income tax expense (benefit) and equity income (loss)	54	68	47	96
Income tax expense (benefit)	(159)	(141)	(313)	(264)
Net income (loss) attributable to parent	213	209	360	360
Regulated electric | MEC
Operating revenue:
Total operating revenue	586	518	1,131	989
Operating expenses:
Cost of sales	103	71	254	151
Regulated natural gas and other | MEC
Operating revenue:
Total operating revenue	107	95	629	305
Operating expenses:
Cost of sales	$ 57	$ 42	$ 489	$ 170