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Investments and Restricted Cash and Cash Equivalents - EEGH - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Investments And Restricted Cash And Investments [Line Items]          
Equity income (loss) $ (13) $ (5) $ (153) $ (234)  
EEGH          
Investments And Restricted Cash And Investments [Line Items]          
Investment exceeded share of equity in net assets 130   130   $ 130
Distributions received from investments     34 30  
Equity income (loss) $ 52 $ 8 $ 80 $ 31  
Iroquois Gas Transmission System, L.P. | EEGH          
Investments And Restricted Cash And Investments [Line Items]          
Equity method investment, ownership percentage 50.00%   50.00%    
Equity income (loss) $ 45