Debt and Credit Agreements (Tables)

3 Months Ended

Mar. 31, 2020

Line of Credit Facility [Line Items]

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

During the three months ended March 31, 2020, the following long-term debt was issued:

Company	Type	Interest Rate		Maturity	Amount		Use of Proceeds
Generation	Energy Efficiency Project Financing(a)	3.95	%	August 31, 2020	$	2	Funding to install energy conservation measures for the Fort Meade project.
Generation	Energy Efficiency Project Financing(a)	2.53	%	April 30, 2021	1		Funding to install energy conservation measures for the Fort AP Hill project.
ComEd	First Mortgage Bonds, Series 129	3.00	%	March 1, 2050	650		Repay a portion of outstanding commercial paper obligations and to fund general corporate purposes.
ComEd	First Mortgage Bonds, Series 128	2.20	%	March 1, 2030	350		Repay a portion of outstanding commercial paper obligations and fund other general corporate purposes.
Pepco(b)	First Mortgage Bonds	2.53	%	February 25, 2030	150		Repay existing indebtedness 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 February 25, 2020, Pepco entered into a purchase agreement of First Mortgage Bonds for $150 million at 3.28% due on September 23, 2050. The closing date of the issuance is expected to occur in September 2020.

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, 2020 and December 31, 2019. PECO had no commercial paper borrowings as of both March 31, 2020 and December 31, 2019.

	Outstanding Commercial Paper as of				Average Interest Rate on Commercial Paper Borrowings as of
Commercial Paper Issuer	March 31, 2020		December 31, 2019		March 31, 2020		December 31, 2019
Exelon(a)	$	979	$	870	2.91	%	2.25	%
Generation	595		320		2.01	%	1.84	%
ComEd	—		130		—	%	2.38	%
BGE	141		76		4.45	%	2.46	%
PHI(b)	108		208		4.25	%	N/A
PEPCO	—		82		—	%	2.56	%
DPL	54		56		4.17	%	2.02	%
ACE	54		70		4.32	%	2.43	%

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(a) Includes outstanding commercial paper at Exelon Corporate of $135 million and $136 million with average interest rates on commercial paper borrowings of 4.20% and 1.92% at March 31, 2020 and December 31, 2019, respectively.

(b) Includes the consolidated amounts of Pepco, DPL, and ACE.