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Regulatory Assets and Liabilities (Schedule of Regulatory Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | $ 1,121 | $ 756
Regulatory assets | 703 | 350
Long-term regulatory liabilities | 8,614 | 5,726
SCE |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 1,121 | 756
Regulatory assets | 703 | 350
Long-term regulatory liabilities | 8,614 | 5,726
Total regulatory liabilities | 9,735 | 6,482
SCE | Regulatory balancing accounts |  |
Regulatory Liabilities [Line Items] |  |
Long-term regulatory liabilities | 1,316 | 1,180
SCE | Energy derivatives |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 74 | 0
SCE | Other |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 38 | 20
Long-term regulatory liabilities | 64 | 60
SCE | Costs of removal |  |
Regulatory Liabilities [Line Items] |  |
Long-term regulatory liabilities | 2,741 | 2,847
SCE | Re-measurement of deferred taxes |  |
Regulatory Liabilities [Line Items] |  |
Long-term regulatory liabilities | 2,892 | 0
SCE | Recoveries in excess of ARO liabilities |  |
Regulatory Liabilities [Line Items] |  |
Long-term regulatory liabilities | 1,575 | 1,639
SCE | Other postretirement benefits |  |
Regulatory Liabilities [Line Items] |  |
Long-term regulatory liabilities | 26 | 0
Regulatory balancing accounts | SCE |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 1,009 | 736
Regulatory assets | $ 484 | $ 135

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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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- Definition The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
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