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Capital Structure (Tables)
 12 Months Ended
Dec. 31, 2014
Capital Structure [Abstract]  
Schedule of Common Stock Activity
The table below summarizes our common stock activity for the years ended December 31, 2014, 2013 and 2012.
 
Shares
Issued
 
Shares
Held in
Treasury
 
Shares
Outstanding
Balance, December 31, 2011
490,468,815

 
(8,725,077
)
 
481,743,738

Shares issued under Calpine Equity Incentive Plans
2,026,285

 
(284,376
)
 
1,741,909

Share repurchase program
—

 
(26,436,677
)
 
(26,436,677
)
Balance, December 31, 2012
492,495,100

 
(35,446,130
)
 
457,048,970

Shares issued under Calpine Equity Incentive Plans
5,345,956

 
(2,323,828
)
 
3,022,128

Share repurchase program
—

 
(31,032,110
)
 
(31,032,110
)
Balance, December 31, 2013
497,841,056

 
(68,802,068
)
 
429,038,988

Shares issued under Calpine Equity Incentive Plans
4,445,966

 
(1,879,167
)
 
2,566,799

Share repurchase program
—

 
(49,684,523
)
 
(49,684,523
)
Balance, December 31, 2014
502,287,022

 
(120,365,758
)
 
381,921,264