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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Securitization Proceeds [Abstract]        
Proceeds from ERCOT $ 689      
Funds Deposited by Counterparties        
Number of months beyond which company can not predict the holding of collateral (in months)   12 months    
Loss Contingency [Abstract]        
Insurance settlement   $ 7 $ 81  
Finite-Lived Intangible Assets, Net [Abstract]        
Intangible assets, accumulated amortization   $ 2,994 2,112  
Capitalized Contract Cost [Abstract]        
Contract with customer, term   5 years    
Gross Receipts and Sales Taxes        
Gross receipts taxes   $ 212 218 $ 184
Purchased Energy and Other Cost of Sales for Customer Operations        
Transmission and distribution charges not yet billed   240 202 189
Foreign Currency Translation and Transaction Gains and Losses        
Cumulative translation adjustment   (43) (55) (8)
Marketing and Advertising Costs        
Advertising expense   $ 185 $ 82 $ 109