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Summary of Significant Accounting Policies - Operations and Maintenance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
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	$ 402	$ 393	$ 367

X

- Definition

Amount of cost charged to expense in oil- and gas-producing activities. Excludes general corporate overhead and interest cost.

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