Investments (Trust Value) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Fair Value Measurements
Fair Values	$ 4,288	$ 4,173
SCE
Fair Value Measurements
Fair Values	4,288	4,173
Deferred income taxes related to unrealized gains	402	380
SCE \| Total debt securities and other
Fair Value Measurements
Amortized Costs	2,282	2,233
Fair Values	2,538	2,515
SCE \| Municipal bonds
Fair Value Measurements
Amortized Costs	647	636
Fair Values	760	757
SCE \| Government and agency securities
Fair Value Measurements
Amortized Costs	1,044	1,072
Fair Values	1,137	1,186
SCE \| Corporate bonds
Fair Value Measurements
Amortized Costs	422	361
Fair Values	463	401
SCE \| Short-term investments and receivables/payables
Fair Value Measurements
Amortized Costs	169	164
Fair Values	178	171
SCE \| Repurchase agreements
Fair Value Measurements
Fair Values	$ 86	$ 38
Repurchase agreement secured by US Treasury Securities (as a percent)	100.00%	100.00%
SCE \| Equity securities
Fair Value Measurements
Fair Values	$ 1,750	$ 1,658
SCE \| Fair Value, Measurements, Recurring
Fair Value Measurements
Fair Values	$ 4,456	$ 4,275

The amount of decommissioning trust assets at amortized cost as of the balance sheet date.

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- Definition

Decommissioning Trust, Deferred Income Taxes

+ References

No definition available.

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- Definition

Repurchase agreement collateralized/secured by US Treasury Securities (as a percent)

+ References

No definition available.

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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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481850/410-20-50-1

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-3

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