Fair Value Measurements (Hierarchy) (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Assets at fair value
Nuclear decommissioning trusts	$ 4,424	$ 4,173
SCE
Assets at fair value
Nuclear decommissioning trusts	$ 4,424	$ 4,173
Liabilities at fair value
Percentage of equity investments located in the United States (as a percent)	75.00%	75.00%
Collateralized mortgage obligations and other asset backed securities	$ 109	$ 106
Receivable (payables), net, related to investments	(108)	(102)
SCE \| Fair Value, Measurements, Recurring
Assets at fair value
Netting and Collateral	(10)	(3)
Derivative contracts, net	37	91
Money market funds and other	27	100
Nuclear decommissioning trusts	4,532	4,275
Total assets	4,596	4,466
Liabilities at fair value
Netting and Collateral	(87)	(77)
Derivative contracts, net	0
Total liabilities	0
Net assets	4,596	4,466
Netting and Collateral, Total	77	74
SCE \| Fair Value, Measurements, Recurring \| Level 1
Assets at fair value
Derivative contracts	0
Money market funds and other	5	78
Nuclear decommissioning trusts	2,743	2,750
Total assets	2,748	2,828
Liabilities at fair value
Derivative contracts	0
Total liabilities	0
Net assets	2,748	2,828
SCE \| Fair Value, Measurements, Recurring \| Level 2
Assets at fair value
Derivative contracts	9	3
Money market funds and other	22	22
Nuclear decommissioning trusts	1,789	1,525
Total assets	1,820	1,550
Liabilities at fair value
Derivative contracts	86	77
Total liabilities	86	77
Net assets	1,734	1,473
SCE \| Fair Value, Measurements, Recurring \| Level 3
Assets at fair value
Derivative contracts	38	91
Money market funds and other	0
Nuclear decommissioning trusts	0
Total assets	38	91
Liabilities at fair value
Derivative contracts	1
Total liabilities	1
Net assets	37	91
SCE \| Fair Value, Measurements, Recurring \| Equity securities
Assets at fair value
Nuclear decommissioning trusts	1,767	1,658
SCE \| Fair Value, Measurements, Recurring \| Equity securities \| Level 1
Assets at fair value
Nuclear decommissioning trusts	1,767	1,658
SCE \| Fair Value, Measurements, Recurring \| Equity securities \| Level 2
Assets at fair value
Nuclear decommissioning trusts	0
SCE \| Fair Value, Measurements, Recurring \| Equity securities \| Level 3
Assets at fair value
Nuclear decommissioning trusts	0
SCE \| Fair Value, Measurements, Recurring \| Fixed Income
Assets at fair value
Nuclear decommissioning trusts	2,659	2,344
SCE \| Fair Value, Measurements, Recurring \| Fixed Income \| Level 1
Assets at fair value
Nuclear decommissioning trusts	929	923
SCE \| Fair Value, Measurements, Recurring \| Fixed Income \| Level 2
Assets at fair value
Nuclear decommissioning trusts	1,730	1,421
SCE \| Fair Value, Measurements, Recurring \| Fixed Income \| Level 3
Assets at fair value
Nuclear decommissioning trusts	0
SCE \| Fair Value, Measurements, Recurring \| Short-term investments, primarily cash equivalents
Assets at fair value
Nuclear decommissioning trusts	106	273
SCE \| Fair Value, Measurements, Recurring \| Short-term investments, primarily cash equivalents \| Level 1
Assets at fair value
Nuclear decommissioning trusts	47	169
SCE \| Fair Value, Measurements, Recurring \| Short-term investments, primarily cash equivalents \| Level 2
Assets at fair value
Nuclear decommissioning trusts	59	$ 104
SCE \| Fair Value, Measurements, Recurring \| Short-term investments, primarily cash equivalents \| Level 3
Assets at fair value
Nuclear decommissioning trusts	$ 0

This element represents the collateralized mortgage obligations and other asset backed securities.

No definition available.

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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 probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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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, 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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