Fair Value Measurements - Schedule of Hierarchy (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Assets at fair value
Nuclear decommissioning trusts	$ 4,231	$ 4,286
SCE
Assets at fair value
Nuclear decommissioning trusts	$ 4,231	$ 4,286
Liabilities at fair value
Percentage of equity investments located in the United States (as a percent)	73.00%	75.00%
Collateralized mortgage obligations and other asset backed securities	$ 65	$ 94
Receivable (payables), net, related to investments	(137)	(105)
SCE \| Fair Value, Recurring
Assets at fair value
Netting and Collateral	(9)	(1)
Derivative contracts, Total	155	212
Money market funds and other	935	22
Nuclear decommissioning trusts	4,368	4,391
Total assets	5,458	4,625
Liabilities at fair value
Netting and Collateral	(22)	(47)
Derivative contracts, Total	0	0
Total liabilities	0	0
Net assets	5,458	4,625
Netting and Collateral, Total	13	46
SCE \| Fair Value, Recurring \| Level 1
Assets at fair value
Derivative contracts	0	0
Money market funds and other	913	0
Nuclear decommissioning trusts	2,647	2,734
Total assets	3,560	2,734
Liabilities at fair value
Derivative contracts	0	0
Total liabilities	0	0
Net assets	3,560	2,734
SCE \| Fair Value, Recurring \| Level 2
Assets at fair value
Derivative contracts	8	1
Money market funds and other	22	22
Nuclear decommissioning trusts	1,721	1,657
Total assets	1,751	1,680
Liabilities at fair value
Derivative contracts	22	47
Total liabilities	22	47
Net assets	1,729	1,633
SCE \| Fair Value, Recurring \| Level 3
Assets at fair value
Derivative contracts	156	212
Money market funds and other	0
Nuclear decommissioning trusts	0	0
Total assets	156	212
Liabilities at fair value
Derivative contracts	0	0
Total liabilities	0	0
Net assets	156	212
SCE \| Fair Value, Recurring \| Equity securities
Assets at fair value
Nuclear decommissioning trusts	1,575	1,631
SCE \| Fair Value, Recurring \| Equity securities \| Level 1
Assets at fair value
Nuclear decommissioning trusts	1,575	1,631
SCE \| Fair Value, Recurring \| Equity securities \| Level 2
Assets at fair value
Nuclear decommissioning trusts	0	0
SCE \| Fair Value, Recurring \| Equity securities \| Level 3
Assets at fair value
Nuclear decommissioning trusts	0	0
SCE \| Fair Value, Recurring \| Fixed Income Securities
Assets at fair value
Nuclear decommissioning trusts	2,664	2,593
SCE \| Fair Value, Recurring \| Fixed Income Securities \| Level 1
Assets at fair value
Nuclear decommissioning trusts	971	975
SCE \| Fair Value, Recurring \| Fixed Income Securities \| Level 2
Assets at fair value
Nuclear decommissioning trusts	1,693	1,618
SCE \| Fair Value, Recurring \| Fixed Income Securities \| Level 3
Assets at fair value
Nuclear decommissioning trusts	0	0
SCE \| Fair Value, Recurring \| Short-term investments, primarily cash equivalents
Assets at fair value
Nuclear decommissioning trusts	129	167
SCE \| Fair Value, Recurring \| Short-term investments, primarily cash equivalents \| Level 1
Assets at fair value
Nuclear decommissioning trusts	101	128
SCE \| Fair Value, Recurring \| Short-term investments, primarily cash equivalents \| Level 2
Assets at fair value
Nuclear decommissioning trusts	28	39
SCE \| Fair Value, Recurring \| Short-term investments, primarily cash equivalents \| Level 3
Assets at fair value
Nuclear decommissioning trusts	$ 0	$ 0

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Derivative, Collateral, Obligation To Return (Right To Reclaim) Cash

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This element represents the percentage of equity investments located in United States.

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Interest and dividends receivables and receivables related to pending securities sales and payables related to pending securities purchases as of the balance sheet date.

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Fair value portion of asset recognized for present right to economic benefit.

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- Definition

The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, and obligation to return cash collateral under master netting arrangements.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, after effect of master netting arrangement and deduction of obligation to return financial collateral not offset and financial instrument subject to master netting arrangement not offset, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and contract can be net settled by means outside contract or delivery of asset. Includes derivative not subject to master netting arrangement or similar agreement.

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fair value, after effect of master netting arrangement and deduction of obligation to return financial collateral not offset and financial instrument subject to master netting arrangement not offset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and contract can be net settled by means outside contract or delivery of asset. Includes derivative not subject to master netting arrangement or similar agreement.

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Fair value of asset associated with financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, and right to receive cash collateral under master netting arrangements.

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Fair value of asset after deduction of liability.

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Fair value of financial and nonfinancial obligations.

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Fair value portion of other assets.

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