Fair Value Measurements - Schedule of Significant Unobservable Inputs Used to Determine Fair Value for Level 3 (Details) - SCE - Level 3 - Valuation, Market Approach $ in Millions	Sep. 30, 2025 USD ($) $ / MWh	Dec. 31, 2024 USD ($) $ / MWh
CRRs
Fair Value Measurements
Fair value, assets \| $	$ 135	$ 212
Fair value, liabilities \| $	$ 3	$ 0
CRRs \| Minimum
Fair Value Measurements
Unobservable inputs (in dollars per MWh)	(19.88)	(4.64)
CRRs \| Maximum
Fair Value Measurements
Unobservable inputs (in dollars per MWh)	28,322.72	50,048.16
CRRs \| Weighted Average
Fair Value Measurements
Unobservable inputs (in dollars per MWh)	27.79	27.20
Fin Toll arrangements
Fair Value Measurements
Fair value, assets \| $	$ 5
Fair value, liabilities \| $	$ 0
Fin Toll arrangements \| Minimum
Fair Value Measurements
Unobservable inputs (in dollars per MWh)	0.00
Fin Toll arrangements \| Maximum
Fair Value Measurements
Unobservable inputs (in dollars per MWh)	89.95
Fin Toll arrangements \| Weighted Average
Fair Value Measurements
Unobservable inputs (in dollars per MWh)	33.40

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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