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Regulatory Assets and Liabilities (Schedule of Regulatory Liabilities) (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | $ 804 | $ 756
Long-term regulatory liabilities | 5,910 | 5,726
Southern California Edison |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 804 | 756
Long-term regulatory liabilities | 5,910 | 5,726
Total regulatory liabilities | 6,714 | 6,482
Southern California Edison | Regulatory balancing accounts |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 740 | 736
Long-term regulatory liabilities | 1,278 | 1,180
Southern California Edison | San Onofre MHI arbitration award |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 47 | 0
Southern California Edison | Other |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 17 | 20
Long-term regulatory liabilities | 59 | 60
Southern California Edison | Costs of removal |  |
Regulatory Liabilities [Line Items] |  |
Long-term regulatory liabilities | 2,838 | 2,847
Southern California Edison | Recoveries in excess of ARO liabilities |  |
Regulatory Liabilities [Line Items] |  |
Long-term regulatory liabilities | $ 1,735 | $ 1,639

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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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- Definition The amount for the individual regulatory current liability as itemized in a table of regulatory current 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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- Definition The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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