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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Restricted Cash and Cash Equivalents Items [Line Items]      
Current $ 299 $ 167  
Non-current 46 34  
Total 345 201  
Basis Of Presentation and Summary of Significant Accounting Policies (Textuals) [Abstract]      
Gain on Business Interruption Insurance Recovery $ 11 14 $ 27
Income Taxes Threshold Percentage 50.00%    
Property, plant and equipment, salvage value (as a percent) 10.00%    
Goodwill $ 242 242  
Impairment losses 84 10 41
Asset retirement obligations 68 63  
Long-term Debt 11,857 10,156  
Property, Plant and Equipment, Net $ 11,963 12,442  
Freestone Energy Center [Member]      
Jointly Owned Plants [Abstract]      
Jointly Owned Utility Plant, Proportionate Ownership Share 75.00%    
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service $ 379    
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation (177)    
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress $ 0    
Hidalgo Energy Center [Member]      
Jointly Owned Plants [Abstract]      
Jointly Owned Utility Plant, Proportionate Ownership Share 78.50%    
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service $ 250    
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation (113)    
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress 0    
Debt Service      
Restricted Cash and Cash Equivalents Items [Line Items]      
Current 58 13  
Non-current 8 8  
Total 66 21  
Construction Major Maintenance      
Restricted Cash and Cash Equivalents Items [Line Items]      
Current 28 23  
Non-current 6 24  
Total 34 47  
Security Project Insurance      
Restricted Cash and Cash Equivalents Items [Line Items]      
Current 209 120  
Non-current 31 0  
Total 240 120  
Other      
Restricted Cash and Cash Equivalents Items [Line Items]      
Current 4 11  
Non-current 1 2  
Total $ 5 13  
Greenfield [Member]      
Basis Of Presentation and Summary of Significant Accounting Policies (Textuals) [Abstract]      
Ownership percentage in equity method investment [1] 50.00%    
Whitby [Member]      
Basis Of Presentation and Summary of Significant Accounting Policies (Textuals) [Abstract]      
Ownership percentage in equity method investment [2] 0.00%    
Calpine Receivables [Member]      
Basis Of Presentation and Summary of Significant Accounting Policies (Textuals) [Abstract]      
Ownership percentage in equity method investment 100.00%    
West [Member]      
Basis Of Presentation and Summary of Significant Accounting Policies (Textuals) [Abstract]      
Impairment losses $ 0 0 28
Texas [Member]      
Basis Of Presentation and Summary of Significant Accounting Policies (Textuals) [Abstract]      
Impairment losses 13 0 13
East [Member]      
Basis Of Presentation and Summary of Significant Accounting Policies (Textuals) [Abstract]      
Impairment losses 71 $ 10 $ 0
Russell City Energy [Member]      
Basis Of Presentation and Summary of Significant Accounting Policies (Textuals) [Abstract]      
Long-term Debt 272    
Property, Plant and Equipment, Net 647    
Los Esteros Project [Member]      
Basis Of Presentation and Summary of Significant Accounting Policies (Textuals) [Abstract]      
Long-term Debt 135    
Property, Plant and Equipment, Net 427    
Minimum [Member]      
Basis Of Presentation and Summary of Significant Accounting Policies (Textuals) [Abstract]      
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification $ 191    
[1] Includes our share of accumulated other comprehensive income/loss related to interest rate hedging instruments associated with our unconsolidated subsidiary Greenfield LP’s debt.
[2] On November 20, 2019, we sold our 50% interest in Whitby to a third party and recorded a gain on sale of assets, net of approximately $5 million.