Fair Value Measurements - Significant Unobservable Inputs (Details) - SCE - Level 3 - Congestion revenue rights - Valuation, Market Approach $ in Millions	Mar. 31, 2025 USD ($) $ / MWh	Dec. 31, 2024 USD ($) $ / MWh
Fair Value Measurements
Fair value, Level 3 assets \| $	$ 156	$ 212
Fair value, Level 3 liabilities \| $	$ 0	$ 0
Minimum
Fair Value Measurements
Unobservable inputs	(7.39)	(4.64)
Maximum
Fair Value Measurements
Unobservable inputs	50,048.16	50,048.16
Weighted Average
Fair Value Measurements
Unobservable inputs	28.09	27.20

Value of input used to measure net derivative asset (liability).

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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