Schedule I - Condensed Financial Information of Parent (Exelon Corporate) - Condensed Balance Sheet (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 445	$ 407	$ 672	$ 432
Accounts receivable
Other accounts receivable, net	1,019	1,344
Regulatory assets	2,215	1,641
Other	473	406
Total current assets	7,777	7,336
Property, plant and equipment, net	73,593	69,076
Deferred debits and other assets
Regulatory assets	8,698	8,037
Total deferred debits and other assets	20,176	18,937
Total assets	101,546	95,349
Current liabilities
Short-term borrowings	2,523	2,586
Long-term debt due within one year	1,403	1,802
Accrued expenses	1,375	1,226
Regulatory liabilities	389	437
Other	968	1,155
Total current liabilities	9,591	10,611
Deferred credits and other liabilities
Regulatory liabilities	9,576	9,112
Pension obligations	1,571	1,109
Other	2,088	1,967
Total deferred credits and other liabilities	26,118	24,332
Total liabilities	75,791	70,605
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)	999	994
Common stock	$ 21,114	$ 20,908
Treasury Stock, Common, Shares	2	2
Treasury stock, at cost	$ (123)	$ (123)
Retained earnings	5,490	4,597
Accumulated other comprehensive loss, net	(726)	(638)
Total shareholders’ equity	25,755	24,744
Total liabilities and member's equity	101,546	95,349
Related Party
Current liabilities
Accounts payable	5	5
Nonrelated Party
Deferred debits and other assets
Other	1,365	1,141
Current liabilities
Accounts payable	2,846	3,382
Long-term debt	39,692	35,272
Corporate, Non-Segment
Current assets
Cash and cash equivalents	26	11
Accounts receivable
Other accounts receivable, net	561	358
Regulatory assets	188	154
Other	17	6
Total current assets	1,031	728
Property, plant and equipment, net	44	44
Deferred debits and other assets
Regulatory assets	2,877	2,650
Investments in affiliates	38,545	35,925
Deferred income taxes	884	929
Non-pension postretirement benefit asset	144	187
Other	107	115
Total deferred debits and other assets	42,557	39,806
Total assets	43,632	40,578
Current liabilities
Short-term borrowings	1,026	948
Long-term debt due within one year	500	850
Accrued expenses	144	101
Regulatory liabilities	10	12
Pension obligations	45	77
Other	49	7
Total current liabilities	2,329	2,543
Long-term debt	10,713	8,742
Deferred credits and other liabilities
Regulatory liabilities	92	103
Pension obligations	4,268	3,896
Deferred income taxes	56	53
Other	419	497
Total deferred credits and other liabilities	4,835	4,549
Total liabilities	17,877	15,834
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)	999	994
Common stock	$ 21,114	$ 20,908
Treasury Stock, Common, Shares	2	2
Treasury stock, at cost	$ (123)	$ (123)
Retained earnings	5,490	4,597
Accumulated other comprehensive loss, net	(726)	(638)
Total shareholders’ equity	25,755	24,744
Total liabilities and member's equity	43,632	40,578
Corporate, Non-Segment | Related Party
Accounts receivable
Other accounts receivable, net	225	182
Accounts receivable from affiliates, current	14	17
Current liabilities
Accounts payable	361	360
Corporate, Non-Segment | Nonrelated Party
Current liabilities
Accounts payable	$ 194	$ 188