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Derivative Instruments - Schedule of Derivative Activity (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2024
USD ($)
MMBTU
Dec. 31, 2023
USD ($)
MMBTU
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]        
Derivative Liability $ 532 $ 617 $ 532  
Derivative assets 3 0 3  
Derivative, Credit Risk Related Contingent Features [Abstract]        
Aggregate fair value of derivatives containing material adverse change provisions in a net liability position 9 9 9  
Fair value of collateral already posted 0 0 0  
Additional collateral required to be posted if credit risk contingent features triggered 9 9 9  
CERC        
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]        
Derivative Liability 10 11 10  
Derivative assets 0 0 0  
Derivative, Credit Risk Related Contingent Features [Abstract]        
Aggregate fair value of derivatives containing material adverse change provisions in a net liability position 8 8 8  
Fair value of collateral already posted 0 0 0  
Additional collateral required to be posted if credit risk contingent features triggered $ 8 $ 8 8  
Indexed debt securities derivative | Gains (Losses) in Other Income (Expense)        
Income Statement Impact of Derivative Activity [Abstract]        
Gain (loss) on derivative instruments not designated as hedging instruments     85 $ (39)
Energy Related Derivative | Derivatives not designated as hedging instruments:        
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]        
Derivative gross volume (in MMBtu) | MMBTU 20,712 27,421    
Energy Related Derivative | Derivatives not designated as hedging instruments: | CERC        
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]        
Derivative gross volume (in MMBtu) | MMBTU 17,753 23,504    
Current Assets: Non-trading derivative assets | Interest rate derivatives | Derivatives designated as cash flow hedges: | Cash Flow Hedge        
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]        
Derivative Assets Fair Value $ 3 $ 0 3  
Derivative Liabilities Fair Value 0 0 0  
Current Liabilities | Indexed debt securities derivative | Derivatives not designated as hedging instruments:        
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]        
Derivative Assets Fair Value 0 0 0  
Derivative Liabilities Fair Value 520 605 520  
Current Liabilities | Energy Related Derivative | Derivatives not designated as hedging instruments:        
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]        
Derivative Assets Fair Value 0 0 0  
Derivative Liabilities Fair Value 9 9 9  
Current Liabilities | Energy Related Derivative | Derivatives not designated as hedging instruments: | CERC        
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]        
Derivative Assets Fair Value 0 0 0  
Derivative Liabilities Fair Value 8 8 8  
Other Liabilities: Non-trading derivative liabilities | Energy Related Derivative | Derivatives not designated as hedging instruments:        
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]        
Derivative Assets Fair Value 0 0 0  
Derivative Liabilities Fair Value 3 3 3  
Other Liabilities: Non-trading derivative liabilities | Energy Related Derivative | Derivatives not designated as hedging instruments: | CERC        
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]        
Derivative Assets Fair Value 0 0 0  
Derivative Liabilities Fair Value $ 2 $ 3 $ 2