Schedule I - Condensed Financial Information of Parent (Exelon Corporate) - Condensed Statements of Operations and Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Expenses [Abstract]
Total operating expenses	$ 17,714	$ 15,761	$ 15,256
Operating income	4,023	3,315	2,682
Other income and (deductions)
Interest expense, net	(1,704)	(1,422)	(1,264)
Other, net	408	535	261
Total other income and (deductions)	(1,321)	(912)	(1,028)
Income taxes	374	349	38
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	2,328	2,054	1,616
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	0	117	213
Net income	2,328	2,171	1,829
Other comprehensive (loss) income, net of income taxes
Prior service benefit reclassified to periodic cost	0	(1)	(4)
Actuarial loss reclassified to periodic cost	26	42	223
Pension and non-pension postretirement benefit plans valuation adjustments	(109)	46	432
Unrealized (loss) gain on cash flow hedges	(5)	2	(1)
Other Comprehensive Income (Loss), Net of Tax	(88)	89	650
Comprehensive income	2,240	2,259	2,356
Corporate, Non-Segment
Operating Expenses [Abstract]
Operating and maintenance	88	25	(9)
Other	1	2	2
Total operating expenses	96	31	7
Operating income	(96)	(31)	(7)
Other income and (deductions)
Interest expense, net	(544)	(413)	(333)
Equity in earnings (losses) of investments	2,728	2,450	1,908
Other, net	19	22	0
Total other income and (deductions)	2,212	2,064	1,575
Income before income taxes	2,116	2,033	1,568
Income taxes	(212)	(21)	(48)
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	2,328	2,054	1,616
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	0	116	90
Net income	2,328	2,170	1,706
Other comprehensive (loss) income, net of income taxes
Prior service benefit reclassified to periodic cost	0	(1)	(4)
Actuarial loss reclassified to periodic cost	26	42	223
Pension and non-pension postretirement benefit plans valuation adjustments	(109)	46	431
Unrealized (loss) gain on cash flow hedges	(5)	2	0
Other Comprehensive Income (Loss), Net of Tax	(88)	89	650
Comprehensive income	2,240	2,259	2,356
Corporate, Non-Segment | Related Party
Operating Expenses [Abstract]
Operating and maintenance from affiliates	7	4	14
Other income and (deductions)
Interest Income from affiliates, net	$ 9	$ 5	$ 0