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Regulatory Assets and Liabilities (Assets) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Regulatory Assets [Line Items] |  |
Current regulatory assets | $ 1,578 | $ 1,314
Regulatory assets: Non-current | 7,543 | 7,120
SCE |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 1,578 | 1,314
Regulatory assets: Non-current | 7,543 | 7,120
Total regulatory assets | 9,121 | 8,434
SCE | Regulatory balancing and memorandum accounts |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 1,390 | 1,127
Regulatory assets: Non-current | 1,815 | 1,794
SCE | Power contracts |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 166 | 165
Regulatory assets: Non-current | 221 | 239
SCE | Other regulatory assets or liabilities |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 22 | 22
Regulatory assets: Non-current | 135 | 106
SCE | Deferred income taxes, net of liabilities |  |
Regulatory Assets [Line Items] |  |
Regulatory assets: Non-current | 4,526 | 4,475
SCE | Pension and other postretirement benefits |  |
Regulatory Assets [Line Items] |  |
Regulatory assets: Non-current | 8 | 12
SCE | Unamortized investments, net of accumulated amortization |  |
Regulatory Assets [Line Items] |  |
Regulatory assets: Non-current | 112 | 114
SCE | Unamortized loss on reacquired debt |  |
Regulatory Assets [Line Items] |  |
Regulatory assets: Non-current | 130 | 133
SCE | Environmental remediation |  |
Regulatory Assets [Line Items] |  |
Regulatory assets: Non-current | 265 | $ 247
SCE | Recoverable assets |  |
Regulatory Assets [Line Items] |  |
Regulatory assets: Non-current | $ 331 |

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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + 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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