Debt and Credit Agreements (Tables)

3 Months Ended

Mar. 31, 2021

Line of Credit Facility [Line Items]

Schedule of Long-term Debt Instruments [Table Text Block]

During the three months ended March 31, 2021, the following long-term debt was issued:

Company	Type	Interest Rate		Maturity	Amount		Use of Proceeds
Exelon	Long-Term Software License Agreements	3.62	%	December 1, 2025	$	4	Procurement of software licenses.
Generation	Energy Efficiency Project Financing(a)	2.53	%	May 31, 2021	1		Funding to install energy conservation measures for the Fort AP Hill project.
ComEd	First Mortgage Bonds, Series 130	3.13	%	March 15, 2051	700		Repay a portion of outstanding commercial paper obligations and two outstanding term loans, and to fund other general corporate purposes.
PECO	First and Refunding Mortgage Bonds	3.05	%	March 15, 2051	375		Funding for general corporate purposes.
Pepco(b)	First Mortgage Bonds	2.32	%	March 30, 2031	150		Repay existing indebtedness and for general corporate purposes.
DPL	First Mortgage Bonds	3.24	%	March 30, 2051	125		Repay existing indebtedness and for general corporate purposes.
ACE	First Mortgage Bonds	2.30	%	March 15, 2031	350		Refinance existing indebtedness, repay outstanding commercial paper obligations, and for general corporate purposes.

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(a)For Energy Efficiency Project Financing, the maturity dates represent the expected date of project completion, upon which the respective customer assumes the outstanding debt.

(b)On March 30, 2021, Pepco entered into a purchase agreement of First Mortgage Bonds of $125 million at 3.29% due on September 28, 2051. The closing date of the issuance is expected to occur in September 2021.

Commercial Paper [Member]

Line of Credit Facility [Line Items]

Schedule of Commercial Paper Borrowings [Table Text Block]

The following table reflects the Registrants' commercial paper programs as of March 31, 2021 and December 31, 2020. PECO had no commercial paper borrowings as of both March 31, 2021 and December 31, 2020.

	Outstanding Commercial Paper as of				Average Interest Rate on Commercial Paper Borrowings as of
Commercial Paper Issuer	March 31, 2021		December 31, 2020		March 31, 2021		December 31, 2020
Exelon(a)(b)	$	1,628	$	1,031	0.52	%	0.25	%
Generation(b)	1,337		340		0.60	%	0.27	%
ComEd	135		323		0.16	%	0.23	%
BGE	156		—		0.15	%	—	%
PHI(c)	—		368		—	%	0.24	%
Pepco	—		35		—	%	0.22	%
DPL	—		146		—	%	0.24	%
ACE	—		187		—	%	0.25	%

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(a)Exelon Corporate had no outstanding commercial paper borrowings as of both March 31, 2021 and December 31, 2020.

(b)Higher outstanding commercial paper primarily driven by increased liquidity needs from the February 2021 extreme cold weather event. See Note 3 – Regulatory Matters for additional information.

(c)Represents the consolidated amounts of Pepco, DPL, and ACE.