Schedule I - Condensed Financial Information of Parent (Exelon Corporate) - Condensed Statements of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net cash flows provided by operating activities	$ 4,870	$ 3,012	$ 4,235
Cash flows from investing activities
Payments for (Proceeds from) Other Investing Activities	0	26	18
Net cash flows used in investing activities	(6,990)	(3,317)	(4,336)
Cash flows from financing activities
Changes in short-term borrowings	986	269	161
Proceeds from short-term borrowings with maturities greater than 90 days	1,300	1,380	500
Repayments on short-term borrowings with maturities greater than 90 days	(1,500)	(350)	0
Issuance of long-term debt	6,309	3,481	7,507
Retirement of long-term debt	(2,073)	(1,640)	(6,440)
Proceeds from Issuance of Common Stock	563	0	0
Dividends paid on common stock	(1,334)	(1,497)	(1,492)
Proceeds from employee stock plans	36	80	45
Other financing activities	(102)	(80)	(136)
Net cash flows provided by (used in) financing activities	1,591	758	145
Increase (decrease) in cash, restricted cash, and cash equivalents	(529)	453	44
Cash, restricted cash, and cash equivalents at beginning of period	1,619	1,166	1,122
Cash, restricted cash, and cash equivalents at end of period	1,090	1,619	1,166
Corporate, Non-Segment [Member]
Net cash flows provided by operating activities	1,690	3,629	3,018
Cash flows from investing activities
Changes in Exelon/PHI intercompany money pool	35	381	(477)
Notes receivable from affiliates	274	0	550
Investment in affiliates	(4,011)	(2,231)	(1,969)
Payments for (Proceeds from) Other Investing Activities	0	1	0
Net cash flows used in investing activities	(3,702)	(1,849)	(1,896)
Cash flows from financing activities
Changes in short-term borrowings	448	0	(136)
Proceeds from short-term borrowings with maturities greater than 90 days	1,150	500	0
Repayments on short-term borrowings with maturities greater than 90 days	(1,300)	(350)	0
Issuance of long-term debt	3,350	0	2,000
Retirement of long-term debt	(1,150)	(300)	(1,450)
Proceeds from Issuance of Common Stock	563	0	0
Dividends paid on common stock	(1,334)	(1,497)	(1,492)
Proceeds from employee stock plans	36	80	45
Other financing activities	(35)	19	(27)
Net cash flows provided by (used in) financing activities	1,728	(1,548)	(1,060)
Increase (decrease) in cash, restricted cash, and cash equivalents	(284)	232	62
Cash, restricted cash, and cash equivalents at beginning of period	295	63	1
Cash, restricted cash, and cash equivalents at end of period	$ 11	$ 295	$ 63