Debt and Credit Agreements (Tables)

3 Months Ended

Mar. 31, 2019

Debt Disclosure [Abstract]

Commercial Paper Borrowings

The following table reflects the Registrants' commercial paper programs as of March 31, 2019 and December 31, 2018. Generation and PECO had no commercial paper borrowings as of both March 31, 2019 and December 31, 2018.

	Outstanding Commercial Paper at				Average Interest Rate on Commercial Paper Borrowings as of
Commercial Paper Issuer	March 31, 2019		December 31, 2018		March 31, 2019		December 31, 2018
Exelon	$	629	$	89	2.63	%	2.15	%
ComEd	322		—		2.64	%	2.14	%
BGE	106		35		2.59	%	2.18	%
PHI	201		54		2.62	%	2.15	%
PEPCO	105		40		2.62	%	2.24	%
DPL	5		—		2.61	%	2.07	%
ACE	91		14		2.62	%	2.21	%

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

During the three months endedMarch 31, 2019, the following long-term debt was issued:

Company	Type	Interest Rate		Maturity	Amount		Use of Proceeds
Generation	Energy Efficiency Project Financing	3.95	%	August 31, 2020	$	2	Funding to install energy conservation measures for the Fort Meade project.
ComEd	First Mortgage Bonds, Series 126	4.00	%	March 1, 2049	$	400	Repay a portion of ComEd’s outstanding commercial paper obligations and fund other general corporate purposes.