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Financing Activities (Narrative) (Details) - USD ($) | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 29, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | May. 31, 2015
Debt Instrument [Line Items] |  |  |  |
Long-term Debt |  | $ 3,914,000,000 | $ 3,787,000,000 |
Senior Unsecured Notes | Senior Unsecured Notes Due 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Extinguishment of Debt, Amount | $ 41,000,000 |  |  |
Weighted average interest rate |  | 8.857% |  |
Make whole premium | $ 14,000,000 |  |  |
Talen Energy Supply |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt |  | $ 3,914,000,000 | $ 3,787,000,000 |
Talen Energy Supply | Unsecured Debt | Redeemable Senior Unsecured Notes due 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  |  |  | 6.50%
Talen Energy Supply | Facility Agreement |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Potential maximum Facility Agreement capacity |  | $ 500,000,000 |  |
Expiration date |  | Jun. 30, 2017 |  |
Talen Energy Supply | Secured Trading Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Secured energy marketing and trading facility capacity |  | $ 1,300,000,000.0 |  |
Term (in years) |  | 5 years |  |
Renewal term |  | 1 year |  |
Long-term Debt |  | $ 87,000,000 |  |

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