Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022		Sep. 30, 2021
Operating revenues
Revenues from alternative revenue programs	$ 64	$ (47)	$ 92		$ 129
Total operating revenues	4,845	4,863	14,412		13,514
Operating expenses
Purchased power and/or fuel from affiliates	0	317	159		867
Operating and maintenance	1,148	1,187	3,436		3,340
Depreciation and amortization	825	758	2,472		2,253
Taxes other than income taxes	377	353	1,061		983
Total operating expenses	3,834	4,107	11,804		11,357
Gain on sales of assets and businesses	0	0	(2)		3
Operating income (loss)	1,011	756	2,606		2,160
Other income and (deductions)
Interest expense, net	(359)	(318)	(1,044)		(947)
Interest expense to affiliates	(6)	(6)	(19)		(20)
Other, net	122	60	435		190
Total other income and (deductions)	(243)	(264)	(628)		(777)
Income (Loss) before income taxes	768	492	1,978		1,383
Income taxes	92	35	356		76
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	676	457	1,622		1,307
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	0	772	117		134
Net income (loss)	676	1,229	1,739		1,441
Net income (loss) attributable to noncontrolling interests	0	26	1		126
Net Income (Loss) Available to Common Stockholders, Basic	676	1,203	1,738		1,315
Net Income (Loss) from Continuing Operations Available to Common Shareholders, Basic	676	457	1,622		1,307
Net Income (Loss) from Discontinued Operations Available to Common Shareholders, Basic	0	746	116		8
Other comprehensive income (loss), net of income taxes
Prior service benefit reclassified to periodic benefit cost	0	(1)	0		(4)
Actuarial loss reclassified to periodic benefit cost	9	56	33		167
Pension and non-pension postretirement benefit plan valuation adjustment	0	14	2		15
Unrealized gain (loss) on foreign currency translation	0	(3)	0		(1)
Other comprehensive income	9	66	35		177
Comprehensive income	685	1,295	1,774		1,618
Comprehensive income attributable to noncontrolling interests	0	26	1		126
Comprehensive income attributable to common shareholders/membership interest	$ 685	$ 1,269	$ 1,773		$ 1,492
Average shares of common stock outstanding:
Basic average shares of common stock outstanding	988	979	983		978
Assumed exercise and/or distributions of stock-based awards	1	1	1		1
Diluted average shares of common stock outstanding	989	980	984	[1]	979	[1]
Earnings Per Share [Abstract]
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.68	$ 0.47	$ 1.65		$ 1.33
Income (Loss) from Continuing Operations, Per Diluted Share	0.68	0.47	1.65		1.33
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share	0	0.76	0.12		0.01
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share	$ 0	$ 0.76	$ 0.12		$ 0.01
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	0	0		0
Commonwealth Edison Co [Member]
Operating revenues
Revenues from alternative revenue programs	$ 88	$ (32)	$ 163		$ 32
Operating revenues from affiliates	6	9	14		19
Total operating revenues	1,378	1,789	4,536		4,840
Operating expenses
Purchased power and/or fuel from affiliates	0	93	59		256
Operating and maintenance	286	257	809		752
Related Party Transaction, Expenses from Transactions with Related Party	69	73	236		217
Depreciation and amortization	333	304	982		893
Taxes other than income taxes	104	91	289		243
Total operating expenses	913	1,428	3,357		3,833
Gain on sales of assets and businesses	0	0	(2)		0
Operating income (loss)	465	361	1,177		1,007
Other income and (deductions)
Interest expense, net	(101)	(95)	(298)		(282)
Interest expense to affiliates	(3)	(3)	(10)		(10)
Other, net	14	13	40		35
Total other income and (deductions)	(90)	(85)	(268)		(257)
Income (Loss) before income taxes	375	276	909		750
Income taxes	84	56	203		141
Net income (loss)	291	220	706		609
Other comprehensive income (loss), net of income taxes
Comprehensive income	291	220	706		609
PECO Energy Co [Member]
Operating revenues
Revenues from alternative revenue programs	(5)	3	1		20
Operating revenues from affiliates	3	2	5		6
Total operating revenues	1,014	818	2,877		2,399
Operating expenses
Purchased power and/or fuel from affiliates	0	60	33		141
Operating and maintenance	197	220	561		580
Related Party Transaction, Expenses from Transactions with Related Party	46	43	144		126
Depreciation and amortization	92	86	277		259
Taxes other than income taxes	60	51	155		143
Total operating expenses	798	677	2,230		1,908
Operating income (loss)	216	141	647		491
Other income and (deductions)
Interest expense, net	(42)	(37)	(120)		(110)
Interest expense to affiliates	(3)	(3)	(9)		(9)
Other, net	8	7	23		20
Total other income and (deductions)	(37)	(33)	(106)		(99)
Income (Loss) before income taxes	179	108	541		392
Income taxes	44	(3)	67		9
Net income (loss)	135	111	474		383
Other comprehensive income (loss), net of income taxes
Comprehensive income	135	111	474		383
Baltimore Gas and Electric Company [Member]
Operating revenues
Revenues from alternative revenue programs	(8)	(24)	(40)		(17)
Operating revenues from affiliates	3	7	13		20
Total operating revenues	870	770	2,810		2,426
Operating expenses
Purchased power and/or fuel from affiliates	0	64	18		193
Operating and maintenance	185	159	506		458
Related Party Transaction, Expenses from Transactions with Related Party	50	46	152		137
Depreciation and amortization	148	142	470		434
Taxes other than income taxes	77	72	225		211
Total operating expenses	810	709	2,446		2,080
Operating income (loss)	60	61	364		346
Other income and (deductions)
Interest expense, net	(39)	(36)	(110)		(103)
Other, net	5	7	16		23
Total other income and (deductions)	(34)	(29)	(94)		(80)
Income (Loss) before income taxes	26	32	270		266
Income taxes	(7)	(4)	3		(24)
Net income (loss)	33	36	267		290
Other comprehensive income (loss), net of income taxes
Comprehensive income	33	36	267		290
Pepco Holdings LLC [Member]
Operating revenues
Revenues from alternative revenue programs	(11)	6	(33)		94
Operating revenues from affiliates	3	3	9		10
Total operating revenues	1,598	1,470	4,223		3,854
Operating expenses
Purchased power and/or fuel from affiliates	0	100	50		277
Operating and maintenance	237	235	729		668
Related Party Transaction, Expenses from Transactions with Related Party	40	43	138		122
Depreciation and amortization	238	210	697		614
Taxes other than income taxes	129	127	362		349
Total operating expenses	1,254	1,155	3,535		3,167
Operating income (loss)	344	315	688		687
Other income and (deductions)
Interest expense, net	(72)	(67)	(216)		(201)
Other, net	19	16	56		52
Total other income and (deductions)	(53)	(51)	(160)		(149)
Income (Loss) before income taxes	291	264	528		538
Income taxes	2	(2)	10		3
Net income (loss)	289	266	518		535
Other comprehensive income (loss), net of income taxes
Comprehensive income attributable to common shareholders/membership interest	289	266	518		535
Potomac Electric Power Company [Member]
Operating revenues
Revenues from alternative revenue programs	(8)	9	(15)		54
Operating revenues from affiliates	2	2	4		4
Total operating revenues	724	660	1,919		1,736
Operating expenses
Purchased power and/or fuel from affiliates	0	69	39		200
Operating and maintenance	69	68	214		186
Related Party Transaction, Expenses from Transactions with Related Party	52	52	166		155
Depreciation and amortization	99	104	312		302
Taxes other than income taxes	105	105	291		282
Total operating expenses	555	501	1,588		1,396
Operating income (loss)	169	159	331		340
Other income and (deductions)
Interest expense, net	(37)	(35)	(111)		(104)
Other, net	14	12	39		37
Total other income and (deductions)	(23)	(23)	(72)		(67)
Income (Loss) before income taxes	146	136	259		273
Income taxes	1	6	(2)		9
Net income (loss)	145	130	261		264
Other comprehensive income (loss), net of income taxes
Comprehensive income	145	130	261		264
Delmarva Power and Light Company [Member]
Operating revenues
Revenues from alternative revenue programs	0	(2)	(3)		17
Operating revenues from affiliates	1	2	5		6
Total operating revenues	412	360	1,176		1,040
Operating expenses
Purchased power and/or fuel from affiliates	0	26	10		63
Operating and maintenance	45	47	142		132
Related Party Transaction, Expenses from Transactions with Related Party	39	40	124		117
Depreciation and amortization	59	53	172		157
Taxes other than income taxes	19	17	54		50
Total operating expenses	345	295	999		858
Operating income (loss)	67	65	177		182
Other income and (deductions)
Interest expense, net	(16)	(15)	(48)		(47)
Other, net	3	3	9		9
Total other income and (deductions)	(13)	(12)	(39)		(38)
Income (Loss) before income taxes	54	53	138		144
Income taxes	2	3	8		9
Net income (loss)	52	50	130		135
Other comprehensive income (loss), net of income taxes
Comprehensive income	52	50	130		135
Atlantic City Electric Company [Member]
Operating revenues
Revenues from alternative revenue programs	(3)	0	(14)		23
Operating revenues from affiliates	0	1	2		2
Total operating revenues	462	451	1,120		1,080
Operating expenses
Purchased power and/or fuel from affiliates	0	5	2		14
Operating and maintenance	47	46	145		128
Related Party Transaction, Expenses from Transactions with Related Party	33	35	106		103
Depreciation and amortization	74	46	192		133
Taxes other than income taxes	2	2	7		6
Total operating expenses	353	359	947		911
Operating income (loss)	109	92	173		169
Other income and (deductions)
Interest expense, net	(17)	(14)	(49)		(43)
Other, net	3	1	9		3
Total other income and (deductions)	(14)	(13)	(40)		(40)
Income (Loss) before income taxes	95	79	133		129
Income taxes	1	(11)	2		(12)
Net income (loss)	94	90	131		141
Other comprehensive income (loss), net of income taxes
Comprehensive income	94	90	131		141
Electricity, US Regulated
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	4,557	4,736	12,972		12,344
Operating expenses
Purchased power and/or fuel	1,404	1,452	4,152		3,598
Electricity, US Regulated | Commonwealth Edison Co [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	1,284	1,812	4,359		4,789
Operating expenses
Purchased power and/or fuel	121	610	982		1,472
Electricity, US Regulated | PECO Energy Co [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	943	757	2,384		2,008
Operating expenses
Purchased power and/or fuel	377	206	850		540
Electricity, US Regulated | Baltimore Gas and Electric Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	761	694	2,138		1,874
Operating expenses
Purchased power and/or fuel	320	206	846		501
Electricity, US Regulated | Pepco Holdings LLC [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	1,568	1,438	4,090		3,632
Operating expenses
Purchased power and/or fuel	586	431	1,474		1,087
Electricity, US Regulated | Potomac Electric Power Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	730	649	1,930		1,678
Operating expenses
Purchased power and/or fuel	230	103	566		271
Electricity, US Regulated | Delmarva Power and Light Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	373	337	1,017		899
Operating expenses
Purchased power and/or fuel	159	103	412		289
Electricity, US Regulated | Atlantic City Electric Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	465	450	1,132		1,055
Operating expenses
Purchased power and/or fuel	197	225	495		527
Natural Gas, US Regulated
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	224	174	1,348		1,041
Operating expenses
Purchased power and/or fuel	80	40	524		316
Natural Gas, US Regulated | PECO Energy Co [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	73	56	487		365
Operating expenses
Purchased power and/or fuel	26	11	210		119
Natural Gas, US Regulated | Baltimore Gas and Electric Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	114	93	699		549
Operating expenses
Purchased power and/or fuel	30	20	229		146
Natural Gas, US Regulated | Pepco Holdings LLC [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	38	23	157		118
Operating expenses
Purchased power and/or fuel	24	9	85		50
Natural Gas, US Regulated | Delmarva Power and Light Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	38	23	157		118
Operating expenses
Purchased power and/or fuel	$ 24	$ 9	$ 85		$ 50

[1] The number of stock options not included in the calculation of diluted common shares outstanding due to their antidilutive effect were none for the three and nine months ended September 30, 2022 and 2021, respectively