Consolidated Balance Sheets (Unaudited) - PECO - USD ($) shares in Millions, $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Current assets
Cash and cash equivalents	$ 720	$ 445
Restricted cash and cash equivalents	489	482
Accounts receivable
Customer accounts receivable	2,896	2,659
Customer allowance for credit losses	(346)	(317)
Customer accounts receivable, net	2,550	2,342
Other accounts receivable	1,131	1,101
Other allowance for credit losses	(96)	(82)
Other accounts receivable, net	1,035	1,019
Inventories, net
Fossil fuel	37	94
Materials and supplies	751	707
Regulatory assets	2,035	2,215
Other	595	473
Total current assets	8,212	7,777
Property, plant and equipment, net	74,604	73,593
Deferred debits and other assets
Regulatory assets	8,701	8,698
Receivable related to Regulatory Agreement Units	3,382	3,232
Investments	263	251
Other	1,419	1,365
Total deferred debits and other assets	20,395	20,176
Total assets	103,211	101,546
Current liabilities
Short-term borrowings	2,206	2,523
Accrued expenses	1,076	1,375
Customer deposits	419	411
Regulatory liabilities	400	389
Other	516	557
Total current liabilities	7,975	9,591
Long-term debt	42,271	39,692
Long-term debt to financing trusts	390	390
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	12,199	11,956
Regulatory liabilities	9,706	9,576
Asset retirement obligations	270	267
Pension obligations	1,569	1,571
Non-pension postretirement benefit obligations	523	527
Mark-to-market derivative liabilities	80	106
Unamortized energy contract liabilities	25	27
Other	2,142	2,088
Total deferred credits and other liabilities	26,514	26,118
Total liabilities	77,150	75,791
Commitments and contingencies
Common stock (in dollars)	$ 0	$ 0
Common stock, shares authorized (in shares)	2,000	2,000
Common stock, shares outstanding (in shares)	1,000	999
Shareholders’ equity
Common stock	$ 21,129	$ 21,114
Treasury stock, common (in shares)	2	2
Treasury stock, at cost	$ (123)	$ (123)
Accumulated other comprehensive loss, net	(712)	(726)
Retained earnings	5,767	5,490
Total shareholders’ equity	26,061	25,755
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	103,211	101,546
Related Party
Current liabilities
Accounts payable	5	5
Long-term debt to financing trusts	390	390
Nonrelated Party
Current liabilities
Accounts payable	2,814	2,846
PECO Energy Co
Current assets
Cash and cash equivalents	39	42
Restricted cash and cash equivalents	9	9
Accounts receivable
Customer accounts receivable	562	527
Customer allowance for credit losses	(107)	(95)
Customer accounts receivable, net	455	432
Other accounts receivable	160	117
Other allowance for credit losses	(13)	(8)
Other accounts receivable, net	147	109
Inventories, net
Fossil fuel	22	50
Materials and supplies	76	67
Prepaid utility taxes	128	2
Regulatory assets	128	127
Other	78	63
Total current assets	1,082	903
Property, plant and equipment, net	13,399	13,128
Deferred debits and other assets
Regulatory assets	834	793
Receivable related to Regulatory Agreement Units	304	278
Investments	37	35
Prepaid pension asset	432	429
Total deferred debits and other assets	1,635	1,564
Total assets	16,116	15,595
Current liabilities
Short-term borrowings	0	165
Accrued expenses	198	236
Customer deposits	78	79
Renewable energy credits, current	54	36
Regulatory liabilities	83	92
Total current liabilities	1,009	1,182
Long-term debt	5,134	5,134
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	2,349	2,321
Regulatory liabilities	340	314
Asset retirement obligations	27	26
Non-pension postretirement benefit obligations	287	286
Other	88	79
Total deferred credits and other liabilities	3,091	3,026
Total liabilities	9,418	9,526
Commitments and contingencies
Shareholders’ equity
Common stock	4,630	4,050
Retained earnings	2,068	2,019
Total shareholders’ equity	6,698	6,069
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	16,116	15,595
PECO Energy Co | Related Party
Accounts receivable
Receivables from affiliates	0	2
Current liabilities
Accounts payable	41	39
Long-term debt to financing trusts	184	184
PECO Energy Co | Nonrelated Party
Deferred debits and other assets
Other	28	29
Current liabilities
Accounts payable	524	512
Other	$ 31	$ 23