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Derivative Instruments - Narrative (Details) - Commodity Contract - SCE - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Derivatives
Cash collateral posted for liability	$ 114	$ 74
Cash collateral posted	83	46
Other Current Liabilities
Derivatives
Cash collateral posted	83	46
Other Current Assets
Derivatives
Cash collateral not offset against liability	$ 31	$ 28

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