Fair Value Measurements (Hierarchy) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Assets at fair value
Nuclear decommissioning trusts	$ 4,769	$ 4,833
SCE
Assets at fair value
Nuclear decommissioning trusts	$ 4,769	$ 4,833
Liabilities at fair value
Percentage of equity investments located in the United States (as a percent)	73.00%	71.00%
Collateralized mortgage obligations and other asset backed securities	$ 30	$ 29
Payables, net, related to investments	47	206
SCE \| Fair Value, Measurements, Recurring
Assets at fair value
Derivative contracts	144	108
Netting and Collateral	(97)	(18)
Money market funds and other	461	62
Nuclear decommissioning trusts	4,816	5,039
Total assets	5,421	5,209
Liabilities at fair value
Derivative contracts	0
Netting and Collateral	(11)	(22)
Total liabilities	0
Net assets	5,421	5,209
Netting and Collateral, Total	(86)	4
SCE \| Fair Value, Measurements, Recurring \| Level 1
Assets at fair value
Derivative contracts	0
Money market funds and other	438	39
Nuclear decommissioning trusts	3,075	2,874
Total assets	3,513	2,913
Liabilities at fair value
Derivative contracts	0
Total liabilities	0
Net assets	3,513	2,913
SCE \| Fair Value, Measurements, Recurring \| Level 2
Assets at fair value
Derivative contracts	128	6
Money market funds and other	23	23
Nuclear decommissioning trusts	1,741	2,165
Total assets	1,892	2,194
Liabilities at fair value
Derivative contracts	3	10
Total liabilities	3	10
Net assets	1,889	2,184
SCE \| Fair Value, Measurements, Recurring \| Level 3
Assets at fair value
Derivative contracts	113	120
Money market funds and other	0
Nuclear decommissioning trusts	0
Total assets	113	120
Liabilities at fair value
Derivative contracts	8	12
Total liabilities	8	12
Net assets	105	108
SCE \| Fair Value, Measurements, Recurring \| Stocks
Assets at fair value
Nuclear decommissioning trusts	1,820	1,908
SCE \| Fair Value, Measurements, Recurring \| Stocks \| Level 1
Assets at fair value
Nuclear decommissioning trusts	1,820	1,908
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	2,687	2,632
SCE \| Fair Value, Measurements, Recurring \| Fixed Income \| Level 1
Assets at fair value
Nuclear decommissioning trusts	1,084	519
SCE \| Fair Value, Measurements, Recurring \| Fixed Income \| Level 2
Assets at fair value
Nuclear decommissioning trusts	1,603	2,113
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	309	499
SCE \| Fair Value, Measurements, Recurring \| Short-term investments, primarily cash equivalents \| Level 1
Assets at fair value
Nuclear decommissioning trusts	171	447
SCE \| Fair Value, Measurements, Recurring \| Short-term investments, primarily cash equivalents \| Level 2
Assets at fair value
Nuclear decommissioning trusts	138	$ 52
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, 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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