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Regulatory Assets and Liabilities (Schedule of Regulatory Assets) (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Regulatory Assets [Line Items] |  |
Current regulatory assets | $ 1,294 | $ 1,133
Long-term regulatory assets | 5,469 | 5,380
Southern California Edison |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 1,294 | 1,133
Long-term regulatory assets | 5,469 | 5,380
Total regulatory assets | 6,763 | 6,513
Southern California Edison | Regulatory balancing accounts |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 987 | 814
Long-term regulatory assets | 346 | 360
Southern California Edison | Power contracts |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 285 | 305
Long-term regulatory assets | 561 | 700
Southern California Edison | Other |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 22 | 14
Long-term regulatory assets | 91 | 55
Southern California Edison | Deferred income taxes, net of liabilities |  |
Regulatory Assets [Line Items] |  |
Long-term regulatory assets | 3,800 | 3,589
Southern California Edison | Pensions and other postretirement benefits |  |
Regulatory Assets [Line Items] |  |
Long-term regulatory assets | 278 | 271
Southern California Edison | Unamortized investments, net of accumulated amortization |  |
Regulatory Assets [Line Items] |  |
Long-term regulatory assets | 113 | 118
Southern California Edison | Unamortized loss on reacquired debt |  |
Regulatory Assets [Line Items] |  |
Long-term regulatory assets | 148 | 153
Southern California Edison | Environmental remediation |  |
Regulatory Assets [Line Items] |  |
Long-term regulatory assets | $ 132 | $ 134

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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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