Schedule I - Condensed Financial Information of Parent (Exelon Corporate) - Debt and Credit Agreements - Schedule of Debt Maturities (Details) (USD $)	Dec. 31, 2014		Jun. 30, 2014
Debt Instrument [Line Items]
2015	$ 1,739,000,000
2016	1,269,000,000
2017	2,400,000,000
2018	1,415,000,000
2019	982,000,000
Thereafter	13,599,000,000	[1]
Total	21,404,000,000		131,000,000
Exelon Corporate [Member]
Debt Instrument [Line Items]
2015	1,350,000,000
2016	0
2017	1,150,000,000
2018	0
2019	0
Thereafter	1,308,000,000
Total	$ 3,808,000,000

[1] Includes $648 million due to ComEd, PECO and BGE financing trusts.