Consolidated Balance Sheets (Unaudited) - PECO - USD ($) shares in Millions, $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Current assets
Cash and cash equivalents	$ 300	$ 407
Restricted cash and cash equivalents	435	566
Accounts receivable
Customer accounts receivable	2,575	2,544
Customer allowance for credit losses	(341)	(327)
Customer accounts receivable, net	2,234	2,217
Other accounts receivable	1,168	1,426
Other allowance for credit losses	(88)	(82)
Other accounts receivable, net	1,080	1,344
Inventories, net
Fossil fuel	105	208
Materials and supplies	657	547
Regulatory assets	2,307	1,641
Other	401	406
Total current assets	7,519	7,336
Property, plant and equipment, net	72,458	69,076
Deferred debits and other assets
Regulatory assets	8,128	8,037
Goodwill	6,630	6,630
Receivable related to Regulatory Agreement Units	2,923	2,897
Investments	246	232
Other	1,355	1,141
Total deferred debits and other assets	19,282	18,937
Total assets	99,259	95,349
Current liabilities
Short-term borrowings	1,720	2,586
Long-term debt due within one year	1,654	1,802
Accrued expenses	1,315	1,226
Regulatory liabilities	437	437
Mark-to-market derivative liabilities	44	8
Unamortized energy contract liabilities	8	10
Other	933	1,155
Total current liabilities	8,800	10,611
Long-term debt	39,431	35,272
Long-term debt to financing trusts	390	390
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	11,792	11,250
Regulatory liabilities	9,236	9,112
Asset retirement obligations	269	269
Pension obligations	1,085	1,109
Non-pension postretirement benefit obligations	515	507
Mark-to-market derivative liabilities	113	83
Unamortized energy contract liabilities	29	35
Other	2,129	1,967
Total deferred credits and other liabilities	25,168	24,332
Total liabilities	73,789	70,605
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)	995	994
Shareholders’ equity
Common stock	$ 20,956	$ 20,908
Treasury stock, common (in shares)	2	2
Treasury stock, at cost	$ (123)	$ (123)
Accumulated other comprehensive loss, net	(596)	(638)
Retained earnings	5,233	4,597
Total shareholders’ equity	25,470	24,744
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	99,259	95,349
Related Party
Current liabilities
Accounts payable	5	5
Long-term debt to financing trusts	390	390
Nonrelated Party
Current liabilities
Accounts payable	2,684	3,382
PECO Energy Co
Current assets
Cash and cash equivalents	43	59
Restricted cash and cash equivalents	9	9
Accounts receivable
Customer accounts receivable	467	635
Customer allowance for credit losses	(95)	(105)
Customer accounts receivable, net	372	530
Other accounts receivable	136	153
Other allowance for credit losses	(8)	(9)
Other accounts receivable, net	128	144
Inventories, net
Fossil fuel	56	99
Materials and supplies	60	52
Prepaid utility taxes	17	0
Regulatory assets	120	80
Other	52	38
Total current assets	909	1,015
Property, plant and equipment, net	12,895	12,125
Deferred debits and other assets
Regulatory assets	762	652
Receivable related to Regulatory Agreement Units	206	237
Investments	34	30
Prepaid pension asset	425	413
Total deferred debits and other assets	1,455	1,362
Total assets	15,259	14,502
Current liabilities
Short-term borrowings	0	239
Long-term debt due within one year	0	50
Accrued expenses	183	142
Customer deposits	77	63
Regulatory liabilities	112	75
Total current liabilities	1,001	1,311
Long-term debt	5,133	4,562
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	2,286	2,213
Regulatory liabilities	239	270
Asset retirement obligations	27	28
Non-pension postretirement benefit obligations	287	286
Other	85	85
Total deferred credits and other liabilities	2,924	2,882
Total liabilities	9,242	8,939
Commitments and contingencies
Shareholders’ equity
Common stock	4,050	3,702
Retained earnings	1,967	1,861
Total shareholders’ equity	6,017	5,563
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	15,259	14,502
PECO Energy Co | Related Party
Accounts receivable
Receivables from affiliates	1	4
Receivable from Exelon/PHI intercompany money pool	51	0
Current liabilities
Accounts payable	37	42
Long-term debt to financing trusts	184	184
PECO Energy Co | Nonrelated Party
Deferred debits and other assets
Other	28	30
Current liabilities
Accounts payable	543	668
Other	$ 49	$ 32