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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