Defined Benefits (Tables)

9 Months Ended

Sep. 30, 2015

Compensation and Retirement Disclosure [Abstract]

Schedule Of Net Periodic Defined Benefit Costs (Credits)

The following table provides the components of net periodic defined benefit costs for Talen Energy pension plans for the periods ended September 30, for which the nine months of 2015 includes four months of costs under the newly formed Talen Energy pension plan. The net periodic defined benefit costs for other postretirement benefit plans for the periods ended September 30, 2015 and 2014 were insignificant.

	Pension Benefits
	Three Months						Nine Months
	2015			2014			2015			2014
Service cost	$	12		$	1		$	19		$	4
Interest cost	18			3			28			7
Expected return on plan assets	(23		)	(3		)	(37		)	(8		)
Amortization of:
Actuarial (gain) loss	6			—			9			1
Net periodic defined benefit costs (credits)	$	13		$	1		$	19		$	4

Allocation of Net Periodic Benefit Costs

The table below provides the costs from defined benefit plans sponsored by PPL Services allocated to Talen Energy Supply based on its participation in those plans prior to the separation on June 1, 2015, which management believes were reasonable at the time. The allocations include costs related to supplemental retirement benefits for executives and other key management employees through unfunded nonqualified retirement plans. The liabilities for these plans were retained by PPL as of the date of the spinoff.

	Three Months				Nine Months
	2015		2014		2015		2014
Pension and other postretirement benefits (a)	$	—	$	2	$	18	$	32

(a) The three and nine months ended September 30, 2014 includes $(5) million and $11 million of termination benefits (credits) related to a one-time voluntary retirement window offered to certain bargaining unit employees upon the ratification of a new union agreement in June 2014. The benefits offered were consistent with the standard separation program benefits for bargaining unit employees.