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Debt and Credit Agreements (Maturitites of Long-term Debt) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014
Long Term Debt By Maturity [Abstract]
Long Term Debt	$ 131
Exelon Generation Co L L C [Member]
Long Term Debt By Maturity [Abstract]
Long Term Debt	$ 1

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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