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

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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.

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Amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership, due after 1 year (or 1 business cycle).

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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For an unclassified balance sheet, amounts due from parties associated with the reporting entity as evidenced by a written promise to pay.

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The net cash inflow or outflow in aggregate debt due to repayments and proceeds from additional borrowings.

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Amount of borrowings from a bank classified as other, maturing within one year or operating cycle, if longer.

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Debt and Credit Agreements - Narrative (Details) - USD ($) $ in Millions				12 Months Ended
	Oct. 11, 2022	Aug. 11, 2022	Jan. 24, 2022	Dec. 31, 2022	Oct. 07, 2022	Jan. 31, 2022	Dec. 31, 2021
Short-term Loan Agreements [Abstract]
Proceeds from (Repayments of) Debt		$ 575
Long-term Debt, Current Maturities				$ 1,802			$ 2,153
Corporate, Non-Segment [Member]
Short-term Loan Agreements [Abstract]
Proceeds from (Repayments of) Debt	$ 575	$ 575
Long-term Debt, Current Maturities				850			1,150
Notes Receivable, Related Parties							319
Due from Affiliate, Noncurrent				0			319
Corporate, Non-Segment [Member] \| ShortTermDebt03232017 [Member]
Short-term Loan Agreements [Abstract]
Short-Term Loans				$ 500
Corporate, Non-Segment [Member] \| ShortTermDebt03232017 [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Short-term Loan Agreements [Abstract]
Short-Term Loans, Interest rate terms				0.65
Corporate, Non-Segment [Member] \| ShortTermDebt03312021.1 [Member]
Short-term Loan Agreements [Abstract]
Short-Term Loans				$ 150
Corporate, Non-Segment [Member] \| ShortTermDebt03312021.1 [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Short-term Loan Agreements [Abstract]
Short-Term Loans, Interest rate terms				0.65
Corporate, Non-Segment [Member] \| ShortTermDebt03312021.2 [Member]
Short-term Loan Agreements [Abstract]
Short-Term Loans				$ 150
Corporate, Non-Segment [Member] \| ShortTermDebt03312021.2 [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Short-term Loan Agreements [Abstract]
Short-Term Loans, Interest rate terms				0.65
Corporate, Non-Segment [Member] \| ShortTermDebt01242022
Short-term Loan Agreements [Abstract]
Short-Term Loans			$ 1,150
Corporate, Non-Segment [Member] \| ShortTermDebt01242022 \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Short-term Loan Agreements [Abstract]
Short-Term Loans, Interest rate terms			0.75
Corporate, Non-Segment [Member] \| ShortTermDebtSOFRplus075PLUS22.5BPincreaseJan2023 \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Short-term Loan Agreements [Abstract]
Short-Term Loans, Interest rate terms				0.975
Corporate, Non-Segment [Member] \| CorpTermLoanApr2024 \| Notes Payable to Banks
Short-term Loan Agreements [Abstract]
Debt Instrument, Face Amount					$ 500
Exelon Corporate [Member] \| Exelon Generation Co L L C [Member]
Short-term Loan Agreements [Abstract]
Due from Affiliate, Noncurrent				$ 0		$ 258	319
Commonwealth Edison Co [Member] \| ShortTermDebtSOFRplus075Oct2023
Short-term Loan Agreements [Abstract]
Short-Term Loans				$ 150
Commonwealth Edison Co [Member] \| ShortTermDebtSOFRplus075Oct2023 \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Short-term Loan Agreements [Abstract]
Short-Term Loans, Interest rate terms				0.75
Delmarva Power & Light Company [Member]
Short-term Loan Agreements [Abstract]
Long-term Debt, Current Maturities				$ 79			$ 79