Derivative Instruments - Schedule of Gross and Net Fair Values of Commodity Derivative Instruments (Details) - SCE - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Derivative Assets Short-Term
Cash collateral posted	$ 60	$ 105
Net amounts presented in the condensed consolidated balance sheets	18	48
Derivative Liabilities Short-Term
Net amounts presented in the condensed consolidated balance sheets	0	0
Commodity
Derivative Assets Short-Term
Gross amounts recognized	19	48
Gross amounts offset in the condensed consolidated balance sheets	(1)
Cash collateral posted	0	0
Net amounts presented in the condensed consolidated balance sheets	18	48
Derivative Liabilities Short-Term
Gross amounts recognized	35	57
Gross amounts offset in the condensed consolidated balance sheets	(1)
Cash collateral posted	(34)	(57)
Net amounts presented in the condensed consolidated balance sheets	$ 0	$ 0

Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets.

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