v3.20.1
Variable Interest Entities and Unconsolidated Investments (Unconsolidated VIEs) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]    
Equity method investment, ownership percentage 50.00%  
Equity method investments $ 63 $ 70
Greenfield    
Schedule of Equity Method Investments [Line Items]    
Equity method investment, ownership percentage 50.00%  
Equity method investments [1] $ 60 66
Calpine Receivables    
Schedule of Equity Method Investments [Line Items]    
Equity method investment, ownership percentage 100.00%  
Equity method investments $ 3 $ 4
[1] Includes our share of AOCI related to interest rate hedging instruments associated with our unconsolidated subsidiary Greenfield LP’s debt.