Investments (Amortized Cost and Fair Value of Nuclear Decommissioning Trusts) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Nuclear Decommissioning Trusts Disclosures
Fair Value	$ 4,267	$ 4,562
Southern California Edison
Nuclear Decommissioning Trusts Disclosures
Amortized Cost	2,474	2,447
Fair Value	4,267	4,562
Southern California Edison \| Municipal bonds
Nuclear Decommissioning Trusts Disclosures
Amortized Cost	1,063	822
Southern California Edison \| U.S. government and agency securities
Nuclear Decommissioning Trusts Disclosures
Amortized Cost	745	996
Southern California Edison \| Corporate bonds
Nuclear Decommissioning Trusts Disclosures
Amortized Cost	575	597
Southern California Edison \| Short-term investments and receivables/payables1
Nuclear Decommissioning Trusts Disclosures
Amortized Cost	91	32
Southern California Edison \| Fair Value, Measurements, Recurring
Nuclear Decommissioning Trusts Disclosures
Fair Value	4,371	4,673
Southern California Edison \| Fair Value, Measurements, Recurring \| Stocks
Nuclear Decommissioning Trusts Disclosures
Fair Value	1,393	1,765
Southern California Edison \| Fair Value, Measurements, Recurring \| Municipal bonds
Nuclear Decommissioning Trusts Disclosures
Fair Value	1,214	970
Southern California Edison \| Fair Value, Measurements, Recurring \| U.S. government and agency securities
Nuclear Decommissioning Trusts Disclosures
Fair Value	928	1,115
Southern California Edison \| Fair Value, Measurements, Recurring \| Corporate bonds
Nuclear Decommissioning Trusts Disclosures
Fair Value	636	679
Southern California Edison \| Fair Value, Measurements, Recurring \| Short-term investments and receivables/payables1
Nuclear Decommissioning Trusts Disclosures
Fair Value	96	33
Repurchase agreements payable	$ 56	$ 41

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

No definition available.

Name:	eix_DecommissioningTrustAssetsAmortizedCost
Namespace Prefix:	eix_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_AssetsHeldInTrustAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

+ Details

Name:	us-gaap_DecommissioningTrustAssetsAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The carrying value of securities purchased to be resold in reverse repurchase transactions as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(m)(2)(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_SecuritiesForReverseRepurchaseAgreements
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	dei_LegalEntityAxis=eix_SouthernCaliforniaEdisonCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByAssetClassAxis=us-gaap_MunicipalBondsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByAssetClassAxis=us-gaap_USGovernmentDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByAssetClassAxis=us-gaap_CorporateBondSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByAssetClassAxis=us-gaap_ShortTermInvestmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByAssetClassAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: