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Regulatory Assets and Liabilities (Schedule of Regulatory Assets) (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) contract | Dec. 31, 2018 USD ($)
Regulatory Assets [Line Items] |  |
Current regulatory assets | $ 1,009 | $ 1,133
Long-term regulatory assets | 6,088 | 5,380
SCE |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 1,009 | 1,133
Long-term regulatory assets | 6,088 | 5,380
Total regulatory assets | 7,097 | 6,513
SCE | Regulatory balancing and memorandum accounts |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 798 | 814
Long-term regulatory assets | 981 | 360
SCE | Power contracts |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 189 | 305
Long-term regulatory assets | 434 | 700
SCE | Other |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 22 | 14
Long-term regulatory assets | 62 | 55
SCE | Deferred income taxes, net of liabilities |  |
Regulatory Assets [Line Items] |  |
Long-term regulatory assets | 4,026 | 3,589
SCE | Pension and other postretirement benefits |  |
Regulatory Assets [Line Items] |  |
Long-term regulatory assets | 87 | 271
SCE | Unamortized investments, net of accumulated amortization |  |
Regulatory Assets [Line Items] |  |
Long-term regulatory assets | 119 | 118
SCE | Unamortized loss on reacquired debt |  |
Regulatory Assets [Line Items] |  |
Long-term regulatory assets | 142 | 153
SCE | Environmental remediation |  |
Regulatory Assets [Line Items] |  |
Long-term regulatory assets | $ 237 | $ 134
SCE | Operating Leases Purchase Power Contracts |  |
Regulatory Assets [Line Items] |  |
Number of power purchase agreements | contract | 2 |
Termination payments in two years | $ 206 |

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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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