Debt and Credit Agreements (Tables)

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Commercial Paper Borrowings

The Registrants had the following amounts of commercial paper borrowings outstanding as of September 30, 2018 and December 31, 2017:

Commercial Paper Borrowings	September 30, 2018		December 31, 2017
Exelon	$	209	$	427
BGE	—		77
PHI(a)	209		350
Pepco	64		26
DPL	—		216
ACE	145		108

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(a) PHI reflects the commercial paper borrowings outstanding of Pepco, DPL and ACE.

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

During the nine months endedSeptember 30, 2018, the following long-term debt was issued:

Company	Type	Interest Rate		Maturity	Amount		Use of Proceeds
Generation	Energy Efficiency Project Financing	3.72	%	November 30, 2018	$	4	Funding to install energy conservation measures for the Smithsonian Zoo project.
Generation	Energy Efficiency Project Financing	3.17	%	October 31, 2018	$	1	Funding to install energy conservation measures in Brooklyn, NY.
Generation	Energy Efficiency Project Financing	2.61	%	September 30, 2018	$	5	Funding to install energy conservation measures for the Pensacola project.
Generation	Energy Efficiency Project Financing	4.17	%	January 1, 2019	$	1	Funding to install energy conservation measures for the General Services Administration Philadelphia project.
Generation	Energy Efficiency Project Financing	4.26	%	May 1, 2019	$	3	Funding to install energy conservation measures for the National Institutes of Health Multi-Buildings Phase II project.
ComEd	First Mortgage Bonds, Series 124	4.00	%	March 1, 2048	$	800	Refinance one series of maturing first mortgage bonds, to repay a portion of ComEd’s outstanding commercial paper obligations and to fund general corporate purposes.
ComEd	First Mortgage Bonds, Series 125	3.70	%	August 15, 2028	$	550	Repay a portion of ComEd’s outstanding commercial paper obligations and to fund general corporate purposes.
PECO	First and Refunding Mortgage Bonds	3.90	%	March 1, 2048	$	325	Refinance a portion of maturing mortgage bonds.
PECO	Loan Agreement	2.00	%	June 20, 2023	$	50	Funding to implement Electric Long-term Infrastructure Improvement Plan.
PECO	First and Refunding Mortgage Bonds	3.90	%	March 1, 2048	$	325	Satisfy short-term borrowings from the Exelon intercompany money pool and for general corporate purposes.
BGE	Senior Notes	4.25	%	September 15, 2048	$	300	Repay commercial paper obligations and for general corporate purposes.
Pepco	First Mortgage Bonds	4.27	%	June 15, 2048	$	100	Repay existing indebtedness and for general corporate purposes.
DPL	First Mortgage Bonds	4.27	%	June 15, 2048	$	200	Repay existing indebtedness and for general corporate purposes.