Fair Value Measurements - Fund Investments Valued at Net Asset Value per Share (Details) - EBP 002 - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	$ 6,943,726	$ 6,275,316
Mutual funds
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	9,864	3,869
Collective investment funds
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	3,906,267	3,320,649
Cash and other short-term investments
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	10,630	10,923
Edison International Stock Fund
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	200,614	305,123
NAV
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	4,281,766	3,704,466
NAV \| Money market fund
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	365,635	379,948
NAV \| Mutual funds
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	9,864	3,869
NAV \| Collective investment funds
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	3,906,267	3,320,649
NAV \| Cash and other short-term investments
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	9,606	8,659
NAV \| Edison International Stock Fund
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	$ 255	$ 646

Fair value of investment, excluding plan interest in master trust, held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Includes, but is not limited to, derivative, investment measured at net asset value per share as practical expedient, and insurance contract not meeting fully-benefit responsive investment criteria.

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+ Details

- Definition

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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