Summary of Significant Accounting Policies - Summarizes SCE's AFUDC Related to Debt and Equity (Details) - SCE - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Receivables
Equity AFUDC	$ 187	$ 157	$ 137
Other income.
Receivables
Equity AFUDC	187	157	137
Interest expense
Receivables
Debt AFUDC	$ 82	$ 74	$ 53

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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