Fair Value Measurements - Significant Unobservable Inputs (Details) - SCE - Level 3 - Congestion revenue rights - Valuation, Market Approach $ in Millions	Dec. 31, 2024 USD ($) $ / MWh	Dec. 31, 2023 USD ($) $ / MWh
Quantitative Information About Level 3 Measurements [Line Items]
Assets \| $	$ 212	$ 91
Liabilities \| $	$ 0	$ 0
Minimum
Quantitative Information About Level 3 Measurements [Line Items]
Unobservable inputs	(4.64)	(6.44)
Maximum
Quantitative Information About Level 3 Measurements [Line Items]
Unobservable inputs	50,048.16	16,574.36
Weighted Average
Quantitative Information About Level 3 Measurements [Line Items]
Unobservable inputs	27.20	2.74

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

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