Debt and Credit Agreements (Tables)

9 Months Ended

Sep. 30, 2020

Line of Credit Facility [Line Items]

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

During the nine months ended September 30, 2020, the following long-term debt was issued:

Company	Type	Interest Rate		Maturity	Amount		Use of Proceeds
Exelon	Notes	4.05	%	April 15, 2030	$	1,250	Repay existing indebtedness and for general corporate purposes.
Exelon	Notes	4.70	%	April 15, 2050	750		Repay existing indebtedness and for general corporate purposes.
Generation	Senior Notes	3.25	%	June 1, 2025	900		Repay existing indebtedness and for general corporate purposes.
Generation	Energy Efficiency Project Financing(a)	3.95	%	December 31, 2020	3		Funding to install energy conservation measures for the Fort Meade project.
Generation	Energy Efficiency Project Financing(a)	2.53	%	April 30, 2021	2		Funding to install energy conservation measures for the Fort AP Hill project.
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.
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.
PECO	First and Refunding Mortgage Bonds	2.80	%	June 15, 2050	350		Funding for general corporate purposes.
BGE	Senior Notes	2.90	%	June 15, 2050	400		Repay commercial paper obligations and for general corporate purposes.
Pepco	First Mortgage Bonds	2.53	%	February 25, 2030	150		Repay existing indebtedness and for general corporate purposes.
Pepco	First Mortgage Bonds	3.28	%	September 23, 2050	150		Repay existing indebtedness and for general corporate purposes.
DPL	First Mortgage Bonds	2.53	%	June 9, 2030	100		Repay existing indebtedness and for general corporate purposes.
DPL(b)	Tax-Exempt Bonds	1.05	%	January 1, 2031	78		Refinance existing indebtedness.
ACE	Tax-Exempt First Mortgage Bonds	2.25	%	June 1, 2029	23		Refinance existing indebtedness.
ACE	First Mortgage Bonds	3.24	%	June 9, 2050	100		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)The bonds have a 1.05% interest rate through July 2025.

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 September 30, 2020 and December 31, 2019. PECO had no commercial paper borrowings as of both September 30, 2020 and December 31, 2019.

	Outstanding Commercial Paper as of				Average Interest Rate on Commercial Paper Borrowings as of
Commercial Paper Issuer	September 30, 2020		December 31, 2019		September 30, 2020		December 31, 2019
Exelon(a)	$	141	$	870	0.16	%	2.25	%
Generation	—		320		—	%	1.84	%
ComEd	141		130		0.16	%	2.38	%
BGE	—		76		—	%	2.46	%
PHI(b)	—		208		—	%	N/A
PEPCO	—		82		—	%	2.56	%
DPL	—		56		—	%	2.02	%
ACE	—		70		—	%	2.43	%

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(a)Includes outstanding commercial paper at Exelon Corporate of $136 million with average interest rates on commercial paper borrowings of 1.92% at December 31, 2019. Exelon Corporate had no outstanding commercial paper borrowings as of September 30, 2020.

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