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Debt and Credit Agreements - Commercial Paper Borrowings Outstanding (Details) (Commercial Paper [Member], USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Exelon Generation Co L L C [Member]
Short-term Debt [Line Items]
Commercial paper borrowings	$ 0	$ 0
Commonwealth Edison Co [Member]
Short-term Debt [Line Items]
Commercial paper borrowings	528	184
Baltimore Gas and Electric Company [Member]
Short-term Debt [Line Items]
Commercial paper borrowings	$ 20	$ 135

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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