Schedule I - Condensed Financial Information of Parent (Exelon Corporate) - Condensed Balance Sheet (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 407	$ 672	$ 432	$ 587
Accounts receivable
Other accounts receivable, net	1,344	996
Regulatory assets, current	1,641	1,296
Other	406	387
Total current assets	7,336	13,957
Property, plant and equipment, net	69,076	64,558
Deferred debits and other assets
Regulatory assets, noncurrent	8,037	8,224
Other	1,141	885
Total deferred debits and other assets	18,937	54,498
Total assets	95,349	133,013
Current liabilities
Short-term borrowings	2,586	1,248
Long-term debt due within one year	1,802	2,153
Accounts payable	3,382	2,379
Accrued expenses	1,226	1,137
Payables to affiliates, current	5	5
Regulatory liabilities, current	437	376
Other	1,155	766
Total current liabilities	10,611	16,111
Long-term debt	35,272	30,749
Deferred credits and other liabilities
Regulatory liabilities, noncurrent	9,112	9,628
Pension obligations	1,109	2,051
Non-pension postretirement benefits obligations	507	811
Other	1,967	1,573
Total deferred credits and other liabilities	24,332	50,968
Total liabilities	70,605	98,218
Commitments and contingencies
Shareholders’ equity
Common Stock, No Par Value	$ 0	$ 0
Common Stock, Shares Authorized	2,000	2,000
Common Stock, Shares, Outstanding	994	979
Common stock	$ 20,908	$ 20,324
Treasury Stock, Shares	2	2
Treasury stock, at cost	$ (123)	$ (123)
Retained earnings	4,597	16,942
Accumulated other comprehensive loss, net	(638)	(2,750)
Total shareholders’ equity	24,744	34,393
Total liabilities and equity	95,349	133,013
Corporate, Non-Segment [Member]
Current assets
Cash and cash equivalents	11	295
Accounts receivable
Other accounts receivable, net	358	318
Accounts receivable from affiliates, current	17	35
Note receivable from affiliates, current	182	217
Regulatory assets, current	154	266
Other	6	41
Total current assets	728	1,172
Property, plant and equipment, net	44	45
Deferred debits and other assets
Regulatory assets, noncurrent	2,650	3,164
Investments in affiliates	35,925	29,563
Amount of investment in equity method investee and investment in and advance to affiliate	0	12,333
Deferred income taxes	929	1,351
Non-pension postretirement benefit asset	187	0
Notes receivable from affiliates, noncurrent	0	319
Other	115	42
Total deferred debits and other assets	39,806	46,772
Total assets	40,578	47,989
Current liabilities
Short-term borrowings	948	650
Long-term debt due within one year	850	1,150
Accounts payable	188	0
Accrued expenses	101	47
Payables to affiliates, current	360	360
Regulatory liabilities, current	12	3
Pension obligations	77	49
Other	7	40
Total current liabilities	2,543	2,299
Long-term debt	8,742	6,265
Deferred credits and other liabilities
Regulatory liabilities, noncurrent	103	63
Pension obligations	3,896	4,416
Non-pension postretirement benefits obligations	0	87
Deferred income taxes	53	362
Other	497	104
Total deferred credits and other liabilities	4,549	5,032
Total liabilities	15,834	13,596
Commitments and contingencies
Shareholders’ equity
Common Stock, No Par Value	$ 0	$ 0
Common Stock, Shares Authorized	2,000	2,000
Common Stock, Shares, Outstanding	994	979
Common stock	$ 20,908	$ 20,324
Treasury Stock, Shares	2	2
Treasury stock, at cost	$ (123)	$ (123)
Retained earnings	4,597	16,942
Accumulated other comprehensive loss, net	(638)	(2,750)
Total shareholders’ equity	24,744	34,393
Total liabilities and equity	$ 40,578	$ 47,989