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, 2026 USD ($) $ / MWh	Dec. 31, 2025 USD ($) $ / MWh
CRRs
Fair Value Measurements
Assets \| $	$ 10	$ 43
CRRs \| Minimum
Fair Value Measurements
Unobservable inputs (in dollars per MWh)	(7.47)	(5.28)
CRRs \| Maximum
Fair Value Measurements
Unobservable inputs (in dollars per MWh)	74.14	14,484.7
CRRs \| Weighted Average
Fair Value Measurements
Unobservable inputs (in dollars per MWh)	15.28	8.39
Fin Toll arrangements
Fair Value Measurements
Assets \| $	$ 5	$ 5
Fin Toll arrangements \| Minimum
Fair Value Measurements
Unobservable inputs (in dollars per MWh)	11.88	0.00
Fin Toll arrangements \| Maximum
Fair Value Measurements
Unobservable inputs (in dollars per MWh)	120.97	97.04
Fin Toll arrangements \| Weighted Average
Fair Value Measurements
Unobservable inputs (in dollars per MWh)	42.19	42.16

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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