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Capital Structure (Tables)
 12 Months Ended
Dec. 31, 2018
Capital Structure [Abstract]  
Schedule of Common Stock Activity
The table below summarizes our common stock activity for the years ended December 31, 2018, 2017 and 2016.
 
Shares
Issued
 
Shares
Held in
Treasury
 
Shares
Outstanding
Balance, December 31, 2015
356,755,747

 
(93,743
)
 
356,662,004

Shares issued under Calpine Equity Incentive Plans
2,871,366

 
(449,079
)
 
2,422,287

Share repurchase program
—

 
(22,527
)
 
(22,527
)
Balance, December 31, 2016
359,627,113

 
(565,349
)
 
359,061,764

Shares issued under Calpine Equity Incentive Plans
2,050,778

 
(596,451
)
 
1,454,327

Balance, December 31, 2017
361,677,891

 
(1,161,800
)
 
360,516,091

Shares issued under Calpine Equity Incentive Plans
355,805

 
(477,711
)
 
(121,906
)
Cancellation of Calpine Corporation common stock in accordance with the Merger Agreement
(362,033,696
)
 
1,639,511

 
(360,394,185
)
Conversion of Merger Sub common stock to Calpine Corporation common stock in accordance with the Merger Agreement
105.2

 
—

 
105.2

Balance, December 31, 2018
105.2

 
—

 
105.2