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Regulatory Assets and Liabilities (Regulatory Balancing Accounts) (Details) - SCE - USD ($) | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Regulatory balancing accounts | Energy resource recovery account |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) pertaining to balancing accounts |  | $ 815,000,000 | $ 464,000,000
Regulatory balancing accounts | New system generation balancing account |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) pertaining to balancing accounts |  | (74,000,000) | (197,000,000)
Revenue subject to refund | Significant components |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) pertaining to balancing accounts |  | (1,250,000,000) | (1,698,000,000)
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) | (1,145,000,000)
Revenue subject to refund | Base revenue requirement balancing account |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) pertaining to balancing accounts |  | (628,000,000) | (200,000,000)
Revenue subject to refund | Tax accounting memorandum account and pole loading balancing account2 |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) pertaining to balancing accounts |  | 28,000,000 | (259,000,000)
Revenue subject to refund | DOE litigation memorandum account |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) pertaining to balancing accounts |  | (69,000,000) | (156,000,000)
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) | (46,000,000)
Revenue subject to refund | Catastrophic event memorandum account |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) pertaining to balancing accounts |  | 144,000,000 | 102,000,000
Revenue subject to refund | Wildfire expense memorandum account |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) pertaining to balancing accounts |  | 128,000,000 | 0
Revenue subject to refund | FERC balancing accounts |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) pertaining to balancing accounts |  | (180,000,000) | (205,000,000)
Revenue subject to refund | Other |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) pertaining to balancing accounts |  | (133,000,000) | $ (56,000,000)
Revenue subject to refund | Tax accounting memorandum reclassified to base revenue requirement balancing account |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) pertaining to balancing accounts |  | $ 263,000,000 |
Forecast | Regulatory balancing accounts | Energy resource recovery account |  |  |
Regulatory Assets and Liabilities |  |  |
4% trigger amount | $ 213,000,000 |  |
5% trigger amount | $ 266,000,000 |  |

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- Definition Energy Resource Recovery Account, Prior Year Generation Rate Revenue Collection, Trigger + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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
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- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
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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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