Discontinued Operations and Disposal Groups (Details) - Income Statement - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Discontinued Operations - Income Statement
Operating and maintenance	$ 1,148	$ 1,187	$ 3,436	$ 3,340
Cost, Depreciation and Amortization	825	758	2,472	2,253
Taxes, Miscellaneous	377	353	1,061	983
Costs and Expenses	3,834	4,107	11,804	11,357
Other, net	122	60	435	190
Nonoperating Income (Expense)	(243)	(264)	(628)	(777)
Income taxes	92	35	356	76
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	0	772	117	134
Net income (loss) attributable to noncontrolling interests	0	26	1	126
Net Income (Loss) from Discontinued Operations Available to Common Shareholders, Basic	$ 0	746	116	8
Total transaction and transition costs incurred related to the Separation		13	52	19
Total transaction costs relating to the Separation			19
Exelon Generation Co L L C [Member]
Discontinued Operations - Income Statement
Revenue from Contract with Customer, Including Assessed Tax		4,083	1,855	13,250
Revenue from Related Parties		325	161	873
Disposal Group, Including Discontinued Operation, Revenue		4,408	2,016	14,123
Purchased power and/or fuel		1,545	1,138	8,102
Operating and maintenance		845	371	3,132
Cost, Depreciation and Amortization		866	94	2,735
Taxes, Miscellaneous		115	44	354
Costs and Expenses		3,371	1,647	14,323
Gain (Loss) on Disposition of Assets		65	10	144
Disposal Group, Including Discontinued Operation, Operating Income (Loss)		1,102	379	(56)
Disposal Group, Including Discontinued Operation, Interest Expense		(73)	(20)	(214)
Other, net		(115)	(281)	561
Nonoperating Income (Expense)		(188)	(301)	347
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax		914	78	291
Income taxes		139	(40)	152
Income (Loss) from Equity Method Investments		(3)	(1)	(5)
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest		772	117	134
Net income (loss) attributable to noncontrolling interests		26	1	126
Net Income (Loss) from Discontinued Operations Available to Common Shareholders, Basic		$ 746	$ 116	$ 8