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Related-Party Transactions (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Related Party Transaction [Line Items] |  |  |
Wildfire insurance expense |  |  | $ 450
SCE |  |  |
Related Party Transaction [Line Items] |  |  |
Current insurance receivable due from affiliates | $ 268 |  | 268
SCE | Wildfire liability insurance | Wholly-owned subsidiary |  |  |
Related Party Transaction [Line Items] |  |  |
Wildfire-related insurance premiums | 0 | $ 0 |
Current insurance receivable due from affiliates | 268 |  | 268
Prepaid Insurance | 28 |  | $ 56
Wildfire insurance expense | $ 43 | $ 50 |

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- Definition Amount of asset related to consideration paid in advance for insurance that provides economic benefits within a future period of one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6387103&loc=d3e6435-108320 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 10 -Section 05 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68074540&loc=d3e5879-108316 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6787-107765 + Details
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