Schedule I - Condensed Financial Information of Parent (Exelon Corporate) - Debt and Credit Agreements - Schedule of Outstanding Long-term Debt (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Long-term debt, gross	$ 44,278	$ 40,889
Unamortized debt discount and premium, net	94	80
Unamortized debt issuance costs	(326)	(296)
Long-term debt (including amounts due within one year)	542	582
Long-term debt, current maturities	(1,453)	(1,403)
Senior unsecured notes
Debt Instrument [Line Items]
Long-term debt, gross	12,280	10,824
Loan agreements
Debt Instrument [Line Items]
Long-term debt, gross	$ 0	$ 500
Minimum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.90%
Minimum \| Senior unsecured notes
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	2.75%
Long-term debt, maturity date	Jun. 15, 2025
Maximum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.275%
Maximum \| Senior unsecured notes
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	7.60%
Maximum \| Loan agreements
Debt Instrument [Line Items]
Long-term debt, maturity date		Apr. 08, 2024
Corporate, Non-Segment
Debt Instrument [Line Items]
Long-term debt, gross	$ 12,095	$ 11,139
Unamortized debt discount and premium, net	(24)	(13)
Unamortized debt issuance costs	(71)	(65)
Long-term debt (including amounts due within one year)	141	152
Long-term debt, current maturities	(807)	(500)
Long-term debt	11,334	10,713
Corporate, Non-Segment \| Senior unsecured notes
Debt Instrument [Line Items]
Long-term debt, gross	12,095	10,639
Corporate, Non-Segment \| Loan agreements
Debt Instrument [Line Items]
Long-term debt, gross	$ 0	$ 500
Debt instrument, basis spread on variable rate	0.85%
Corporate, Non-Segment \| Minimum \| Senior unsecured notes
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	2.75%
Long-term debt, maturity date	Jun. 15, 2025
Corporate, Non-Segment \| Maximum \| Senior unsecured notes
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	7.60%
Long-term debt, maturity date	Mar. 15, 2053
Corporate, Non-Segment \| Maximum \| Loan agreements
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	6.23%
Long-term debt, maturity date		Apr. 08, 2024

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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