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Summary of Significant Accounting Policies - Operations and Maintenance (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Operating Expense      
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]      
Results of Operations, Expense from Oil and Gas Producing Activities $ 393 $ 367 $ 180