Face (par) amount of debt instrument at time of issuance.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	instant

- Definition

Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Debt and Credit Agreements - Issuance of Long-Term Debt (Details) - USD ($) $ in Millions	18 Months Ended
	Apr. 07, 2024	Oct. 07, 2022	Sep. 30, 2022
Corporate [Member] \| SMBCTermLoanJuly2023 \| Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest Rate			0.65%
Debt Instrument, Face Amount			$ 300
Corporate [Member] \| USBTermLoanJuly2023 \| Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest Rate			0.65%
Debt Instrument, Face Amount			$ 300
Corporate [Member] \| PNCTermLoanJuly2023 \| Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest Rate			0.65%
Debt Instrument, Face Amount			$ 250
Corporate [Member] \| Notes275Mar2027 \| Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest Rate			2.75%
Debt Instrument, Face Amount			$ 650
Corporate [Member] \| Notes335Mar2032 \| Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest Rate			3.35%
Debt Instrument, Face Amount			$ 650
Corporate [Member] \| Notes410Mar2052 \| Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest Rate			4.10%
Debt Instrument, Face Amount			$ 700
Corporate [Member] \| Notes230Dec2025 \| Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest Rate			2.30%
Debt Instrument, Face Amount			$ 17
Corporate [Member] \| CorpTermLoanApr2024 \| Notes Payable to Banks [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 500
Debt Instrument, Interest Rate Terms	SOFR plus 0.85
Commonwealth Edison Co [Member] \| FMB315Mar2032 \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate			3.15%
Debt Instrument, Face Amount			$ 300
Commonwealth Edison Co [Member] \| FMB385Mar2052 \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate			3.85%
Debt Instrument, Face Amount			$ 450
PECO Energy Co [Member] \| FMB350May2052 \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate			4.60%
Debt Instrument, Face Amount			$ 350
PECO Energy Co [Member] \| FMB425August2052 \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate			4.375%
Debt Instrument, Face Amount			$ 425
Baltimore Gas and Electric Company [Member] \| Notes500June2052 \| Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest Rate			4.55%
Debt Instrument, Face Amount			$ 500
Potomac Electric Power Company [Member] \| FMB397Mar2052 \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate			3.97%
Debt Instrument, Face Amount			$ 400
Potomac Electric Power Company [Member] \| FMB335Sep2032 \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate			3.35%
Debt Instrument, Face Amount			$ 225
Delmarva Power and Light Company [Member] \| FMB306Feb2052 \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate			3.06%
Debt Instrument, Face Amount			$ 125
Atlantic City Electric Company [Member] \| FMB227Feb2032 \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate			2.27%
Debt Instrument, Face Amount			$ 25
Atlantic City Electric Company [Member] \| ACEFMB306Feb20502 \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate			3.06%
Debt Instrument, Face Amount			$ 150