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Quarterly Consolidated Financial Data (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Consolidated Financial Data (unaudited)
 
Quarter Ended
 
December 31
 
September 30
 
June 30
 
March 31
 
(in millions, except per share amounts)
2014
 
 
 
 
 
 
 
Operating revenues
$
1,939

 
$
2,187

 
$
1,939

 
$
1,965

Income from operations
$
390

 
$
1,126

 
$
329

 
$
144

Net income (loss) attributable to Calpine
$
210

 
$
614

 
$
139

 
$
(17
)
Net income (loss) per common share attributable to Calpine — Basic
$
0.55

 
$
1.54

 
$
0.33

 
$
(0.04
)
Net income (loss) per common share attributable to Calpine — Diluted
$
0.54

 
$
1.52

 
$
0.33

 
$
(0.04
)
 
 
 
 
 
 
 
 
2013
 
 
 
 
 
 
 
Operating revenues
$
1,438

 
$
2,050

 
$
1,572

 
$
1,241

Income from operations
$
151

 
$
597

 
$
122

 
$
4

Net income (loss) attributable to Calpine
$
(97
)
 
$
306

 
$
(70
)
 
$
(125
)
Net income (loss) per common share attributable to Calpine — Basic
$
(0.23
)
 
$
0.70

 
$
(0.16
)
 
$
(0.28
)
Net income (loss) per common share attributable to Calpine — Diluted
$
(0.23
)
 
$
0.70

 
$
(0.16
)
 
$
(0.28
)