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Defined Benefits | 3 Months Ended
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Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract] |
Defined Benefits | Defined Benefits The table below provides the components of net periodic defined benefit costs for Talen Energy pension plans for the three months ended March 31. The net periodic defined benefit costs for Talen Energy's other postretirement benefit plans for the three months ended March 31, 2016 and 2015 were insignificant.
|  | 2016 |  | 2015
Service cost |  | $ | 10 |  |  | $ | 1 |
Interest cost |  | 19 |  |  | 2 |
Expected return on plan assets |  | (23 | ) |  | (3 | )
Amortization of: |  |  |  |
Actuarial (gain) loss |  | 5 |  |  | 1 |
Net periodic defined benefit costs (credits) |  | $ | 11 |  |  | $ | 1 |
For the three months ended March 31, 2015, Talen Energy Supply was also allocated $11 million of costs of defined benefit plans sponsored by PPL Services based on Talen Energy Supply's participation in those plans prior to the spinoff, which management believes were reasonable at the time.

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