Fair Value Measurements (Hierarchy) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Assets at fair value
Nuclear decommissioning trusts	$ 3,823	$ 4,870
SCE
Assets at fair value
Nuclear decommissioning trusts	$ 3,823	$ 4,870
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	$ 46	$ 30
Payables, net, related to investments	51	19
SCE \| Fair Value, Measurements, Recurring
Assets at fair value
Netting and Collateral	(16)	(31)
Derivative contracts, net	54	44
Money market funds and other	26	253
Nuclear decommissioning trusts	3,874	4,889
Total assets	3,954	5,186
Liabilities at fair value
Netting and Collateral	(40)	(47)
Derivative contracts, net	0
Total liabilities	0
Net assets	3,954	5,186
Netting and Collateral, Total	24	16
SCE \| Fair Value, Measurements, Recurring \| Level 1
Assets at fair value
Derivative contracts	0
Money market funds and other	4	230
Nuclear decommissioning trusts	2,507	3,157
Total assets	2,511	3,387
Liabilities at fair value
Derivative contracts	0
Total liabilities	0
Net assets	2,511	3,387
SCE \| Fair Value, Measurements, Recurring \| Level 2
Assets at fair value
Derivative contracts	15	26
Money market funds and other	22	23
Nuclear decommissioning trusts	1,367	1,732
Total assets	1,404	1,781
Liabilities at fair value
Derivative contracts	38	42
Total liabilities	38	42
Net assets	1,366	1,739
SCE \| Fair Value, Measurements, Recurring \| Level 3
Assets at fair value
Derivative contracts	55	49
Money market funds and other	0
Nuclear decommissioning trusts	0
Total assets	55	49
Liabilities at fair value
Derivative contracts	2	5
Total liabilities	2	5
Net assets	53	44
SCE \| Fair Value, Measurements, Recurring \| Equity securities
Assets at fair value
Nuclear decommissioning trusts	1,465	1,972
SCE \| Fair Value, Measurements, Recurring \| Equity securities \| Level 1
Assets at fair value
Nuclear decommissioning trusts	1,465	1,972
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	2,094	2,690
SCE \| Fair Value, Measurements, Recurring \| Fixed Income \| Level 1
Assets at fair value
Nuclear decommissioning trusts	839	1,083
SCE \| Fair Value, Measurements, Recurring \| Fixed Income \| Level 2
Assets at fair value
Nuclear decommissioning trusts	1,255	1,607
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	315	227
SCE \| Fair Value, Measurements, Recurring \| Short-term investments, primarily cash equivalents \| Level 1
Assets at fair value
Nuclear decommissioning trusts	203	102
SCE \| Fair Value, Measurements, Recurring \| Short-term investments, primarily cash equivalents \| Level 2
Assets at fair value
Nuclear decommissioning trusts	112	$ 125
SCE \| Fair Value, Measurements, Recurring \| Short-term investments, primarily cash equivalents \| Level 3
Assets at fair value
Nuclear decommissioning trusts	$ 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 probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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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, 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 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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