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Earnings (Loss) Per Share for Talen Energy Corporation (Details) - USD ($) $ in Millions |  | 3 Months Ended
--- | --- | ---
Jun. 01, 2015 | Mar. 31, 2016 | Mar. 31, 2015
Income (Numerator) |  |  |
Net Income (Loss) |  | $ 151 | $ 96
Shares of Common Stock (Denominator) |  |  |
Weighted-average shares - Basic EPS (in shares) |  | 128,526,000 | 83,524,000
Share-based payment awards |  | 492,000 | 0
Weighted-average shares - Diluted EPS (in shares) |  | 129,018,000 | 83,524,000
Shares Issued (Numeric) [Abstract] |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) |  | 1,241,000 |
Common Stock |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |
Stock issuance (shares) | 128,499,023 |  |
Common stock shares issued to PPL shareholders | 83,524,365 |  |
Common stock issued for acquisition of RJS Power, shares | 44,974,658 |  |

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