Schedule I - Condensed Financial Information of Parent (Exelon Corporate) - Condensed Balance Sheet (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current assets
Cash and cash equivalents	$ 357	$ 445	$ 407	$ 672
Accounts receivable
Other accounts receivable, net	1,016	1,019
Regulatory assets	1,940	2,215
Other	445	370
Total current assets	8,384	8,087
Property, plant and equipment, net	78,182	73,593
Deferred debits and other assets
Regulatory assets	8,710	8,698
Total deferred debits and other assets	21,218	20,176
Total assets	107,784	101,856
Current liabilities
Short-term borrowings	1,859	2,523
Long-term debt due within one year	1,453	1,403
Accrued expenses	1,468	1,375
Regulatory liabilities	411	389
Other	512	519
Total current liabilities	9,611	9,901
Deferred credits and other liabilities
Regulatory liabilities	10,198	9,576
Pension obligations	1,745	1,571
Other	2,282	2,088
Total deferred credits and other liabilities	27,915	26,118
Total liabilities	80,863	76,101
Commitments and contingencies
Shareholders’ equity
Common Stock, No Par Value	$ 0	$ 0
Common stock, shares authorized (in shares)	2,000	2,000
Common stock, shares, outstanding (in shares)	1,005	999
Common stock	$ 21,338	$ 21,114
Treasury Stock, Common, Shares	2	2
Treasury stock, at cost	$ (123)	$ (123)
Retained earnings	6,426	5,490
Accumulated other comprehensive loss, net	(720)	(726)
Total shareholders’ equity	26,921	25,755
Total liabilities and member's equity	107,784	101,856
Related Party
Current liabilities
Accounts payable	5	5
Nonrelated Party
Deferred debits and other assets
Other	1,562	1,365
Current liabilities
Accounts payable	2,994	2,846
Long-term debt	42,947	39,692
Corporate, Non-Segment
Current assets
Cash and cash equivalents	4	26
Accounts receivable
Other accounts receivable, net	288	561
Regulatory assets	186	188
Other	19	17
Total current assets	733	1,031
Property, plant and equipment, net	45	44
Deferred debits and other assets
Regulatory assets	2,851	2,877
Investments in affiliates	40,741	38,545
Deferred income taxes	747	884
Non-pension postretirement benefit asset	186	144
Other	149	107
Total deferred debits and other assets	44,674	42,557
Total assets	45,452	43,632
Current liabilities
Short-term borrowings	927	1,026
Long-term debt due within one year	807	500
Accrued expenses	155	144
Regulatory liabilities	11	10
Pension obligations	40	45
Other	3	49
Total current liabilities	2,445	2,329
Long-term debt	11,334	10,713
Deferred credits and other liabilities
Regulatory liabilities	94	92
Pension obligations	4,346	4,268
Deferred income taxes	50	56
Other	262	419
Total deferred credits and other liabilities	4,752	4,835
Total liabilities	18,531	17,877
Commitments and contingencies
Shareholders’ equity
Common Stock, No Par Value	$ 0	$ 0
Common stock, shares authorized (in shares)	2,000	2,000
Common stock, shares, outstanding (in shares)	1,005	999
Common stock	$ 21,338	$ 21,114
Treasury Stock, Common, Shares	2	2
Treasury stock, at cost	$ (123)	$ (123)
Retained earnings	6,426	5,490
Accumulated other comprehensive loss, net	(720)	(726)
Total shareholders’ equity	26,921	25,755
Total liabilities and member's equity	45,452	43,632
Corporate, Non-Segment | Related Party
Accounts receivable
Other accounts receivable, net	217	225
Accounts receivable from affiliates, current	19	14
Current liabilities
Accounts payable	360	361
Corporate, Non-Segment | Nonrelated Party
Current liabilities
Accounts payable	$ 142	$ 194