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Quarterly Consolidated Financial Data (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Consolidated Financial Data (unaudited)
 
Quarter Ended
 
December 31
 
September 30
 
June 30
 
March 31
 
(in millions)
2019
 
 
 
 
 
 
 
Operating revenues
$
2,082

 
$
2,792

 
$
2,599

 
$
2,599

Income from operations
$
108

 
$
682

 
$
444

 
$
358

Net income (loss) attributable to Calpine
$
(156
)
 
$
485

 
$
266

 
$
175

 
 
 
 
 
 
 
 
2018
 
 
 
 
 
 
 
Operating revenues
$
2,354

 
$
2,890

 
$
2,259

 
$
2,009

Income (loss) from operations
$
105

 
$
568

 
$
417

 
$
(328
)
Net income (loss) attributable to Calpine
$
(16
)
 
$
272

 
$
352

 
$
(598
)