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Quarterly Consolidated Financial Data (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2013
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)
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
)
 
 
 
 
 
 
 
 
2012
 
 
 
 
 
 
 
Operating revenues
$
1,367

 
$
1,996

 
$
879

 
$
1,236

Income (loss) from operations
$
295

 
$
705

 
$
(193
)
 
$
195

Net income (loss) attributable to Calpine
$
100

 
$
437

 
$
(329
)
 
$
(9
)
Net income (loss) per common share attributable to Calpine — Basic
$
0.22

 
$
0.95

 
$
(0.69
)
 
$
(0.02
)
Net income (loss) per common share attributable to Calpine — Diluted
$
0.22

 
$
0.94

 
$
(0.69
)
 
$
(0.02
)