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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Net income (loss) $ 151 $ 96
Amounts arising during the period - gains (losses), net of tax (expense) benefit:    
Available-for-sale securities, net of tax 3 5
Reclassifications from AOCI - (gains) losses, net of tax expense (benefit):    
Available-for-sale securities, net of tax 1 (1)
Qualifying derivatives, net of tax (3) (4)
Defined benefit plans:    
Net actuarial loss, net of tax 3 4
Total other comprehensive income (loss) 4 4
Comprehensive income (loss) 155 100
Talen Energy Supply    
Net income (loss) 151 96
Amounts arising during the period - gains (losses), net of tax (expense) benefit:    
Available-for-sale securities, net of tax 3 5
Reclassifications from AOCI - (gains) losses, net of tax expense (benefit):    
Available-for-sale securities, net of tax 1 (1)
Qualifying derivatives, net of tax (3) (4)
Defined benefit plans:    
Net actuarial loss, net of tax 3 4
Total other comprehensive income (loss) 4 4
Comprehensive income (loss) $ 155 $ 100