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	Mar. 31, 2026 USD ($) $ / MWh	Dec. 31, 2025 USD ($) $ / MWh
CRRs
Fair Value Measurements
Assets \| $	$ 16	$ 43
Liabilities \| $	$ 0	$ 0
CRRs \| Minimum
Fair Value Measurements
Unobservable inputs (in dollars per MWh)	(5.28)	(5.28)
CRRs \| Maximum
Fair Value Measurements
Unobservable inputs (in dollars per MWh)	543.10	14,484.7
CRRs \| Weighted Average
Fair Value Measurements
Unobservable inputs (in dollars per MWh)	13.74	8.39
Fin Toll arrangements
Fair Value Measurements
Assets \| $	$ 2	$ 5
Liabilities \| $	$ 0	$ 0
Fin Toll arrangements \| Minimum
Fair Value Measurements
Unobservable inputs (in dollars per MWh)	(0.27)	0.00
Fin Toll arrangements \| Maximum
Fair Value Measurements
Unobservable inputs (in dollars per MWh)	38.90	97.04
Fin Toll arrangements \| Weighted Average
Fair Value Measurements
Unobservable inputs (in dollars per MWh)	13.35	42.16

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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