Fair Value Measurements (Hierarchy) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Assets at fair value
Nuclear decommissioning trusts	$ 4,527	$ 4,870
SCE
Assets at fair value
Nuclear decommissioning trusts	$ 4,527	$ 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	$ 37	$ 30
Payables, net, related to investments	22	19
SCE \| Fair Value, Measurements, Recurring
Assets at fair value
Derivative contracts	63	44
Netting and Collateral	(37)	(31)
Money market funds and other	85	253
Nuclear decommissioning trusts	4,549	4,889
Total assets	4,697	5,186
Liabilities at fair value
Derivative contracts	0
Netting and Collateral	(18)	(47)
Total liabilities	0
Net assets	4,697	5,186
Netting and Collateral, Total	(19)	16
SCE \| Fair Value, Measurements, Recurring \| Level 1
Assets at fair value
Derivative contracts	0
Money market funds and other	63	230
Nuclear decommissioning trusts	2,937	3,157
Total assets	3,000	3,387
Liabilities at fair value
Derivative contracts	0
Total liabilities	0
Net assets	3,000	3,387
SCE \| Fair Value, Measurements, Recurring \| Level 2
Assets at fair value
Derivative contracts	57	26
Money market funds and other	22	23
Nuclear decommissioning trusts	1,612	1,732
Total assets	1,691	1,781
Liabilities at fair value
Derivative contracts	14	42
Total liabilities	14	42
Net assets	1,677	1,739
SCE \| Fair Value, Measurements, Recurring \| Level 3
Assets at fair value
Derivative contracts	43	49
Money market funds and other	0
Nuclear decommissioning trusts	0
Total assets	43	49
Liabilities at fair value
Derivative contracts	4	5
Total liabilities	4	5
Net assets	39	44
SCE \| Fair Value, Measurements, Recurring \| Stocks
Assets at fair value
Nuclear decommissioning trusts	1,879	1,972
SCE \| Fair Value, Measurements, Recurring \| Stocks \| Level 1
Assets at fair value
Nuclear decommissioning trusts	1,879	1,972
SCE \| Fair Value, Measurements, Recurring \| Stocks \| Level 2
Assets at fair value
Nuclear decommissioning trusts	0
SCE \| Fair Value, Measurements, Recurring \| Stocks \| Level 3
Assets at fair value
Nuclear decommissioning trusts	0
SCE \| Fair Value, Measurements, Recurring \| Fixed Income
Assets at fair value
Nuclear decommissioning trusts	2,505	2,690
SCE \| Fair Value, Measurements, Recurring \| Fixed Income \| Level 1
Assets at fair value
Nuclear decommissioning trusts	977	1,083
SCE \| Fair Value, Measurements, Recurring \| Fixed Income \| Level 2
Assets at fair value
Nuclear decommissioning trusts	1,528	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	165	227
SCE \| Fair Value, Measurements, Recurring \| Short-term investments, primarily cash equivalents \| Level 1
Assets at fair value
Nuclear decommissioning trusts	81	102
SCE \| Fair Value, Measurements, Recurring \| Short-term investments, primarily cash equivalents \| Level 2
Assets at fair value
Nuclear decommissioning trusts	84	$ 125
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, 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, 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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