Debt and Credit Agreements (Credit Facilities) (Details) $ in Millions	12 Months Ended
Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Line of Credit Facility [Line Items]
Commitment	$ 4,850
Outstanding borrowings	601
Outstanding letters of credit	195
Amount available	$ 4,054
Edison International Parent and Other
Line of Credit Facility [Line Items]
Covenant debt to total capitalization ratio	0.70
Actual debt to capitalization ratio	0.61
Commitment	$ 1,500
Amount available	1,500
Edison International Parent and Other \| Multi-year credit facilities
Line of Credit Facility [Line Items]
Commitment	1,500
Amount available	1,500
Contingent maximum available borrowing	$ 2,000
Edison International Parent and Other \| Multi-year credit facilities \| SOFR
Line of Credit Facility [Line Items]
Basis points	1.28%
Edison International Parent and Other \| Multi-year credit facilities \| Commercial paper
Line of Credit Facility [Line Items]
Outstanding borrowings	$ 0	$ 130
Weighted average interest rate (as a percent)		0.42%
SCE
Line of Credit Facility [Line Items]
Covenant debt to total capitalization ratio	0.65
Actual debt to capitalization ratio	0.55
Commitment	$ 3,350
Outstanding borrowings	601
Outstanding letters of credit	195
Amount available	2,554
SCE \| Multi-year credit facilities
Line of Credit Facility [Line Items]
Commitment	3,350
Outstanding borrowings	601
Outstanding letters of credit	195
Amount available	2,554
Contingent maximum available borrowing	$ 4,000
SCE \| Multi-year credit facilities \| SOFR
Line of Credit Facility [Line Items]
Basis points	1.08%
SCE \| Multi-year credit facilities \| Commercial paper
Line of Credit Facility [Line Items]
Outstanding borrowings	$ 601	$ 725
Weighted average interest rate (as a percent)	0.45%	0.43%

Debt Instrument, Covenant, Ratio of Debt to Total Capitalization

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- Definition

The aggregate borrowing capacity under the credit facility, consisting of the maximum borrowing capacity plus the contingent increase, if any one or more of the existing banks or new banks agree to provide such increased commitment amount.

+ References

No definition available.

+ Details

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

+ Details

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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

No definition available.

+ Details

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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Balance Type:	credit
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- Definition

Indebtedness divided by net capital.

+ References

No definition available.

+ Details

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- Definition

Weighted average interest rate of short-term debt outstanding calculated at point in time.

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