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Investments Accounted for by the Equity Method and Variable Interest Entities - PG&E Bankruptcy (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Investments Accounted for by the Equity Method    
Equity investments in affiliates $ 388 $ 412
Agua Caliente    
Investments Accounted for by the Equity Method    
Equity investments in affiliates 213  
Ivanpah Master Holdings, LLC    
Investments Accounted for by the Equity Method    
Equity investments in affiliates $ 20