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Capital Structure (Tables)
 12 Months Ended
Dec. 31, 2012
Capital Structure [Abstract]  
Schedule of Common Stock Activity
The table below summarizes our common stock activity for the years ended December 31, 2012, 2011 and 2010.
 
Shares
Issued
 
Shares
Held in
Treasury
 
Shares
Held in
Reserve
 
Total
Balance, December 31, 2009
443,325,827

 
(327,572
)
 
44,747,044

 
487,745,299

Resolution of claims
488,612

 
—

 
(488,612
)
 
—

Shares issued under Calpine Equity Incentive Plans
1,068,917

 
(120,586
)
 
—

 
948,331

Balance, December 31, 2010
444,883,356

 
(448,158
)
 
44,258,432

 
488,693,630

Resolution of claims
44,258,432

 
—

 
(44,258,432
)
 
—

Shares issued under Calpine Equity Incentive Plans
1,327,027

 
(139,846
)
 
—

 
1,187,181

Share repurchase program
—

 
(8,137,073
)
 
—

 
(8,137,073
)
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