Schedule I - Condensed Financial Information of Parent (Exelon Corporate) - Condensed Statements of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net cash flows provided by operating activities	$ 4,703	$ 4,870	$ 3,012
Cash flows from investing activities
Payments for (Proceeds from) Other Investing Activities	8	0	26
Net cash flows used in investing activities	(7,375)	(6,990)	(3,317)
Cash flows from financing activities
Changes in short-term borrowings	(313)	986	269
Proceeds from short-term borrowings with maturities greater than 90 days	400	1,300	1,380
Repayments on short-term borrowings with maturities greater than 90 days	(150)	(1,500)	(350)
Issuance of long-term debt	5,825	6,309	3,481
Retirement of long-term debt	(1,713)	(2,073)	(1,640)
Proceeds from Issuance of Common Stock	140	563	0
Dividends paid on common stock	(1,433)	(1,334)	(1,497)
Proceeds from employee stock plans	41	36	80
Other financing activities	(114)	(102)	(80)
Net cash flows provided by financing activities	2,683	1,591	758
(Decrease) increase in cash, restricted cash, and cash equivalents	11	(529)	453
Cash, restricted cash, and cash equivalents at beginning of period	1,090	1,619	1,166
Cash, restricted cash, and cash equivalents at end of period	1,101	1,090	1,619
Corporate, Non-Segment
Net cash flows provided by operating activities	1,486	1,690	3,629
Cash flows from investing activities
Changes in Exelon/PHI intercompany money pool	(43)	35	381
Notes receivable from affiliates	0	274	0
Investment in affiliates	(1,864)	(4,011)	(2,231)
Payments for (Proceeds from) Other Investing Activities	(1)	0	1
Net cash flows used in investing activities	(1,908)	(3,702)	(1,849)
Cash flows from financing activities
Changes in short-term borrowings	78	448	0
Proceeds from short-term borrowings with maturities greater than 90 days	0	1,150	500
Repayments on short-term borrowings with maturities greater than 90 days	0	(1,300)	(350)
Issuance of long-term debt	2,500	3,350	0
Retirement of long-term debt	(850)	(1,150)	(300)
Proceeds from Issuance of Common Stock	140	563	0
Dividends paid on common stock	(1,433)	(1,334)	(1,497)
Proceeds from employee stock plans	41	36	80
Other financing activities	(39)	(35)	19
Net cash flows provided by financing activities	437	1,728	(1,548)
(Decrease) increase in cash, restricted cash, and cash equivalents	15	(284)	232
Cash, restricted cash, and cash equivalents at beginning of period	11	295	63
Cash, restricted cash, and cash equivalents at end of period	$ 26	$ 11	$ 295