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Regulatory Assets and Liabilities (Schedule of Regulatory Assets) (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
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Regulatory Assets [Line Items] |  |
Current regulatory assets | $ 321 | $ 560
Long-term regulatory assets | 7,844 | 7,512
Environmental remediation |  |
Regulatory Assets [Line Items] |  |
Long-term regulatory assets | 128 | 129
Southern California Edison |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 321 | 560
Long-term regulatory assets | 7,844 | 7,512
Total regulatory assets | 8,165 | 8,072
Southern California Edison | Regulatory balancing accounts |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 135 | 382
Long-term regulatory assets | 36 | 36
Southern California Edison | Energy derivatives |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 167 | 159
Long-term regulatory assets | 1,010 | 1,027
Southern California Edison | Other |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 19 | 19
Long-term regulatory assets | 264 | 288
Southern California Edison | Deferred income taxes, net |  |
Regulatory Assets [Line Items] |  |
Long-term regulatory assets | 4,346 | 3,757
Southern California Edison | Pensions and other postretirement benefits |  |
Regulatory Assets [Line Items] |  |
Long-term regulatory assets | 829 | 849
Southern California Edison | Unamortized investments, net |  |
Regulatory Assets [Line Items] |  |
Long-term regulatory assets | 143 | 182
Southern California Edison | San Onofre |  |
Regulatory Assets [Line Items] |  |
Long-term regulatory assets | 899 | 1,043
Southern California Edison | Unamortized loss on reacquired debt |  |
Regulatory Assets [Line Items] |  |
Long-term regulatory assets | $ 189 | $ 201

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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://www.xbrl.org/2003/role/presentationRef -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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