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Regulatory Assets and Liabilities (Regulatory Balancing Accounts) (Details) - SCE - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Nov. 30, 2018 | Dec. 31, 2019
Regulatory Assets and Liabilities |  |  |
Wildfire insurance coverage | $ 1,000,000,000.0 | $ 300,000,000 |
Regulatory balancing accounts | Energy resource recovery account |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) pertaining to balancing accounts | 815,000,000 |  | $ (23,000,000)
4% trigger amount |  |  | 200,000,000
5% trigger amount |  |  | 250,000,000
Regulatory balancing accounts | Portfolio allocation balancing account |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) pertaining to balancing accounts | 0 |  | 537,000,000
Regulatory balancing accounts | New system generation balancing account |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) pertaining to balancing accounts | (74,000,000) |  | 85,000,000
Revenue subject to refund | Significant components |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) pertaining to balancing accounts | (1,250,000,000) |  | (365,000,000)
Revenue subject to refund | Public purpose programs and energy efficiency programs |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) pertaining to balancing accounts | (1,200,000,000) |  | (1,235,000,000)
Revenue subject to refund | Base revenue requirement balancing account |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) pertaining to balancing accounts | (628,000,000) |  | (328,000,000)
Revenue subject to refund | Tax accounting memorandum account and pole loading balancing account |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) pertaining to balancing accounts | 28,000,000 |  | 17,000,000
Revenue subject to refund | DOE litigation memorandum account |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) pertaining to balancing accounts | (69,000,000) |  | (35,000,000)
Revenue subject to refund | Greenhouse gas auction revenue and low carbon fuel standard revenue |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) pertaining to balancing accounts | (81,000,000) |  | (196,000,000)
Revenue subject to refund | FERC balancing accounts |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) pertaining to balancing accounts | (180,000,000) |  | (127,000,000)
Revenue subject to refund | Wildfire expense memorandum account |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) pertaining to balancing accounts | 272,000,000 |  | 868,000,000
Revenue subject to refund | Other |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) pertaining to balancing accounts | $ (133,000,000) |  | $ 72,000,000

X
- Definition Energy Resource Recovery Account, Prior Year Generation Rate Revenue Collection, Trigger + References No definition available. + Details
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Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Energy Resource Recovery Account, Prior Year Generation Rate Revenue, Trigger + References No definition available. + Details
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Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
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- Definition Wildfire Insurance Coverage + References No definition available. + Details
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Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The net amount of all regulatory assets less all regulatory liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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