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Regulatory Assets and Liabilities (Schedule of Regulatory Assets) (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) contract | Dec. 31, 2017 USD ($) | Dec. 19, 2017 USD ($)
Regulatory Assets [Line Items] |  |  |
Current regulatory assets | $ 1,133 | $ 703 |
Long-term regulatory assets | 5,380 | 4,914 |
SCE |  |  |
Regulatory Assets [Line Items] |  |  |
Current regulatory assets | 1,133 | 703 |
Long-term regulatory assets | 5,380 | 4,914 |
Total regulatory assets | 6,513 | 5,617 |
SCE | Regulatory balancing accounts |  |  |
Regulatory Assets [Line Items] |  |  |
Current regulatory assets | 814 | 484 |
Long-term regulatory assets | 360 | 143 |
SCE | Power contracts |  |  |
Regulatory Assets [Line Items] |  |  |
Current regulatory assets | 305 | 203 |
Long-term regulatory assets | 700 | 799 |
SCE | Other |  |  |
Regulatory Assets [Line Items] |  |  |
Current regulatory assets | 14 | 16 |
Long-term regulatory assets | 55 | 51 |
SCE | Deferred income taxes, net of liabilities |  |  |
Regulatory Assets [Line Items] |  |  |
Long-term regulatory assets | 3,589 | 3,143 |
SCE | Pensions and other postretirement benefits |  |  |
Regulatory Assets [Line Items] |  |  |
Long-term regulatory assets | 271 | 271 |
SCE | Unamortized investments, net of accumulated amortization |  |  |
Regulatory Assets [Line Items] |  |  |
Long-term regulatory assets | 118 | 123 |
SCE | San Onofre |  |  |
Regulatory Assets [Line Items] |  |  |
Long-term regulatory assets | 0 | 72 | $ 775
SCE | Unamortized loss on reacquired debt |  |  |
Regulatory Assets [Line Items] |  |  |
Long-term regulatory assets | 153 | 168 |
SCE | Environmental remediation |  |  |
Regulatory Assets [Line Items] |  |  |
Long-term regulatory assets | $ 134 | $ 144 |
SCE | Operating Leases Purchase Power Contracts |  |  |
Regulatory Assets [Line Items] |  |  |
Number of Contracts Amended | contract | 2 |  |
Termination payments next year | $ 100 |  |
Termination payments in two years | 77 |  |
Termination payments in three years | $ 29 |  |

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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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