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	Jun. 30, 2025 USD ($) $ / MWh	Dec. 31, 2024 USD ($) $ / MWh
CRRs
Fair Value Measurements
Fair value, assets \| $	$ 173	$ 212
Fair value, liabilities \| $	$ 5	$ 0
CRRs \| Minimum
Fair Value Measurements
Unobservable inputs (in dollars per MWh)	(10.95)	(4.64)
CRRs \| Maximum
Fair Value Measurements
Unobservable inputs (in dollars per MWh)	36,279.67	50,048.16
CRRs \| Weighted Average
Fair Value Measurements
Unobservable inputs (in dollars per MWh)	42.24	27.20
Fin Toll arrangements
Fair Value Measurements
Fair value, assets \| $	$ 11
Fair value, liabilities \| $	$ 0
Fin Toll arrangements \| Minimum
Fair Value Measurements
Unobservable inputs (in dollars per MWh)	(2.70)
Fin Toll arrangements \| Maximum
Fair Value Measurements
Unobservable inputs (in dollars per MWh)	174.67
Fin Toll arrangements \| Weighted Average
Fair Value Measurements
Unobservable inputs (in dollars per MWh)	63.00

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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