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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Securitization Proceeds        
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        
Insurance settlement     $ 7 $ 81
Intangible Assets        
Intangible assets, accumulated amortization   $ 3,632 2,994  
Capitalized Contract Cost        
Contract with customer, term   5 years    
Gross Receipts and Sales Taxes        
Gross receipts taxes   $ 216 212 218
Purchased Energy and Other Cost of Sales for Customer Operations        
Transmission and distribution charges not yet billed   284 240 202
Foreign Currency Translation and Transaction Gains and Losses        
Cumulative translation adjustment   (72) (43) (55)
Marketing and Advertising Costs        
Advertising expense   $ 215 $ 185 $ 82