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Derivative Instruments - Schedule of Gross and Net Fair Values of Commodity Derivative Instruments (Details) - SCE - Commodity Contract - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Derivative Assets
Gross amounts recognized	$ 140	$ 213
Gross amounts offset in the condensed consolidated balance sheets	(3)	(1)
Cash collateral posted	0	0
Net amounts presented in the condensed consolidated balance sheets	137	212
Derivative Liabilities
Gross amounts recognized	86	47
Gross amounts offset in the condensed consolidated balance sheets	(3)	(1)
Cash collateral posted	(83)	(46)
Net amounts presented in the condensed consolidated balance sheets	$ 0	$ 0

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