Financing Activities (Tables)

9 Months Ended

Sep. 30, 2015

Debt Disclosure [Abstract]

Schedule of Line of Credit Facilities

The amounts borrowed below are recorded as "Short-term debt" on the Balance Sheets. The following credit facility was in place at:         

	September 30, 2015
	Expiration Date	Capacity		Borrowed		Letters of Credit Issued		Unused Capacity
Syndicated Secured Credit Facility (a)	June 2020	$	1,850	$	—	$	334	$	1,516

(a) The facility includes capacity available for letters of credit and for short-term borrowings. The facility requires Talen Energy Supply to maintain a senior secured debt to adjusted EBITDA ratio (as defined in the agreement) of less than or equal to 4.50 to 1.00 as of the last day of any fiscal quarter. The company pays customary fees on the facility and borrowings bear interest at the company's option at either a defined base rate or LIBOR-based rates, in each case plus an applicable margin.