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Acquisitions and Dispositions - Direct Energy Purchase Price Allocation (Details) - USD ($)
$ in Millions
 12 Months Ended
Jan. 05, 2021
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2021
Other Assets        
Goodwill   $ 1,650 $ 5,079 $ 1,795
Texas        
Other Assets        
Goodwill   710 643 716
East        
Other Assets        
Goodwill   $ 723 $ 721 $ 853
Customer Relationships        
Other Liabilities        
Weighted average useful life, years   6 years    
Direct Energy        
Current Assets        
Cash and cash equivalents   $ 152    
Funds deposited by counterparties   21    
Restricted cash   9    
Accounts receivable, net   1,802    
Inventory   106    
Derivative instruments   1,014    
Cash collateral paid in support of energy risk management activities   233    
Prepayments and other current assets   173    
Total current assets   3,510    
Property, plant and equipment, net   151    
Other Assets        
Goodwill   1,250    
Intangible assets   2,321    
Derivative instruments   531    
Other non-current assets   31    
Total other assets   4,133    
Total Assets   7,794    
Current Liabilities        
Accounts payable   1,116    
Derivative instruments   1,266    
Cash collateral received in support of energy risk management activities   21    
Accrued expenses and other current liabilities   670    
Total current liabilities   3,073    
Other Liabilities        
Derivative instruments   562    
Deferred income taxes   320    
Other non-current liabilities   115    
Total other liabilities   997    
Total Liabilities   4,070    
Direct Energy Purchase Price   3,724    
Goodwill, expected to be tax deductible   322    
Direct Energy | Texas        
Other Assets        
Goodwill   427    
Direct Energy | East        
Other Assets        
Goodwill   648    
Direct Energy | West/Services/Other        
Other Assets        
Goodwill   175    
Direct Energy | Customer Relationships        
Other Assets        
Intangible assets   1,277    
Other Liabilities        
Weighted average useful life, years 12 years      
Direct Energy | Customer and Supply Contracts        
Other Assets        
Intangible assets   610    
Other Liabilities        
Weighted average useful life, years 12 years      
Direct Energy | Trade Names        
Other Assets        
Intangible assets   310    
Other Liabilities        
Weighted average useful life, years 12 years      
Direct Energy | Renewables Energy Certificates        
Other Assets        
Intangible assets   $ 124    
Other Liabilities        
Weighted average useful life, years 12 years