Debt and Credit Agreements (Tables)

9 Months Ended

Sep. 30, 2017

Debt Disclosure [Abstract]

Commercial Paper Borrowings

The Registrants had the following amounts of commercial paper borrowings outstanding as ofSeptember 30, 2017 and December 31, 2016:

Commercial Paper Borrowings	September 30, 2017		December 31, 2016
Exelon	$	118	$	688
Generation	—		620
BGE	—		45
PHI	118		23
Pepco	—		23
DPL	54		—
ACE	65		—

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

During the nine months endedSeptember 30, 2017, the following long-term debt was issued:

Company	Type	Interest Rate		Maturity	Amount		Use of Proceeds
Exelon	Junior Subordinated Notes(a)	3.50	%	June 1, 2022	$	1,150	Refinance Exelon's Junior Subordinated Notes issued in June 2014.
Generation	Albany Green Energy Project Financing	LIBOR + 1.25%		November 17, 2017	$	14	Albany Green Energy biomass generation development.
Generation	Energy Efficiency Project Financing	3.90	%	February 1, 2018	$	17	Funding to install energy conservation measures for the Naval Station Great Lakes project.
Generation	Energy Efficiency Project Financing	2.61	%	September 30, 2018	$	10	Funding to install energy conservation measures for the Pensacola project.
Generation	Energy Efficiency Project Financing	3.53	%	April 1, 2019	$	8	Funding to install energy conservation measures for the State Department project.
Generation	Energy Efficiency Project Financing	3.72	%	May 1, 2018	$	4	Funding to install energy conservation measures for the Smithsonian Zoo project.
Generation	Senior Notes	2.95	%	January 15, 2020	$	250	Repay outstanding commercial paper obligations and for general corporate purposes.
Generation	Senior Notes	3.40	%	March 15, 2022	$	500	Repay outstanding commercial paper obligations and for general corporate purposes.
Generation	ExGen Texas Power Nonrecourse Debt	LIBOR + 4.75%		September 18, 2021	$	6	Funding for general corporate purposes.
ComEd	First Mortgage Bonds, Series 122	2.95	%	August 15, 2027	$	350	Refinance maturing first mortgage bonds, to repay a portion of ComEd’s outstanding commercial paper obligations and for general corporate purposes.
ComEd	First Mortgage Bonds, Series 123	3.75	%	August 15, 2047	$	650	Refinance maturing first mortgage bonds, to repay a portion of ComEd’s outstanding commercial paper obligations and for general corporate purposes.
PECO	First and Refunding Mortgage Bonds	3.70	%	September 15, 2047	$	325	General corporate purposes.
BGE	Notes	3.75	%	August 15, 2047	$	300	Redeem $250 million in principal amount of the 6.20% Deferrable Interest Subordinated Debentures due October 15, 2043 issued by BGE's affiliate BGE Capital Trust II, repay commercial paper obligations and for general corporate purposes.
Pepco	Energy Efficiency Project Financing	3.30	%	December 15, 2017	$	2	Funding to install energy conservation measures for the DOE Germantown project.
Pepco	First Mortgage Bonds	4.15	%	March 15, 2043	$	200	Funding to repay outstanding commercial paper and for general corporate purposes.

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(a) See the Junior Subordinated Notes discussion below for further information.