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Regulatory Assets and Liabilities (Liabilities) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | $ 524 | $ 569
Long-term regulatory liabilities | 8,881 | 8,589
SCE |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 524 | 569
Long-term regulatory liabilities | 8,881 | 8,589
Total regulatory liabilities | 9,405 | 9,158
SCE | Revenue subject to refund |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 427 | 471
Long-term regulatory liabilities | 1,279 | 1,062
SCE | Energy derivatives |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 84 | 87
SCE | Other regulatory assets or liabilities |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 13 | 11
Long-term regulatory liabilities | 45 | 48
SCE | Costs of removal |  |
Regulatory Liabilities [Line Items] |  |
Long-term regulatory liabilities | 2,727 | 2,595
SCE | Re-measurement of deferred taxes |  |
Regulatory Liabilities [Line Items] |  |
Long-term regulatory liabilities | 2,256 | 2,283
SCE | Recoveries in excess of ARO liabilities |  |
Regulatory Liabilities [Line Items] |  |
Long-term regulatory liabilities | 1,901 | 1,930
SCE | Other postretirement benefits |  |
Regulatory Liabilities [Line Items] |  |
Long-term regulatory liabilities | $ 673 | $ 671

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- Definition The amount for the individual regulatory liability as itemized in a table of 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 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
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- Definition The amount for the individual regulatory current liability as itemized in a table of regulatory current 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 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
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