Fair Value Measurements (Hierarchy) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Assets at fair value
Nuclear decommissioning trusts	$ 3,943	$ 3,948
SCE
Assets at fair value
Nuclear decommissioning trusts	$ 3,943	$ 3,948
Liabilities at fair value
Percentage of equity investments located in the United States (as a percent)	75.00%	74.00%
Collateralized mortgage obligations and other asset backed securities	$ 87	$ 49
Receivable (payables), net, related to investments	(90)	(85)
SCE \| Fair Value, Measurements, Recurring
Assets at fair value
Netting and Collateral	(5)	(218)
Derivative contracts, net	34	241
Money market funds and other	22	669
Nuclear decommissioning trusts	4,033	4,033
Total assets	4,089	4,943
Liabilities at fair value
Netting and Collateral	(45)	(119)
Derivative contracts, net	0	1
Total liabilities	0	1
Net assets	4,089	4,942
Netting and Collateral, Total	40	(99)
SCE \| Fair Value, Measurements, Recurring \| Level 1
Assets at fair value
Derivative contracts	0
Money market funds and other	0	647
Nuclear decommissioning trusts	2,665	2,688
Total assets	2,665	3,335
Liabilities at fair value
Derivative contracts	0
Total liabilities	0
Net assets	2,665	3,335
SCE \| Fair Value, Measurements, Recurring \| Level 2
Assets at fair value
Derivative contracts	5	392
Money market funds and other	22	22
Nuclear decommissioning trusts	1,368	1,345
Total assets	1,395	1,759
Liabilities at fair value
Derivative contracts	45	116
Total liabilities	45	116
Net assets	1,350	1,643
SCE \| Fair Value, Measurements, Recurring \| Level 3
Assets at fair value
Derivative contracts	34	67
Money market funds and other	0
Nuclear decommissioning trusts	0
Total assets	34	67
Liabilities at fair value
Derivative contracts	0	4
Total liabilities	0	4
Net assets	34	63
SCE \| Fair Value, Measurements, Recurring \| Equity securities
Assets at fair value
Nuclear decommissioning trusts	1,550	1,610
SCE \| Fair Value, Measurements, Recurring \| Equity securities \| Level 1
Assets at fair value
Nuclear decommissioning trusts	1,550	1,610
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	2,266	2,222
SCE \| Fair Value, Measurements, Recurring \| Fixed Income \| Level 1
Assets at fair value
Nuclear decommissioning trusts	927	941
SCE \| Fair Value, Measurements, Recurring \| Fixed Income \| Level 2
Assets at fair value
Nuclear decommissioning trusts	1,339	1,281
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	217	201
SCE \| Fair Value, Measurements, Recurring \| Short-term investments, primarily cash equivalents \| Level 1
Assets at fair value
Nuclear decommissioning trusts	188	137
SCE \| Fair Value, Measurements, Recurring \| Short-term investments, primarily cash equivalents \| Level 2
Assets at fair value
Nuclear decommissioning trusts	29	$ 64
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.

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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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