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Fair Value Measurements (Quantitative Information About Level 3 Fair Value Measurements) (Details) - SCE - Level 3 $ in Millions | 12 Months Ended
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Dec. 31, 2016 USD ($) $ / MWh MW | Dec. 31, 2015 USD ($) $ / MWh MW
Congestion revenue rights | Market simulation model and auction prices |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value, Assets | $ | $ 67 | $ 152
Fair Value, Liabilities | $ | $ 0 | $ 0
Congestion revenue rights | Market simulation model and auction prices | Load forecast | Minimum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair value inputs, power units (in megawatts) | MW | 3,708 | 6,289
Congestion revenue rights | Market simulation model and auction prices | Load forecast | Maximum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair value inputs, power units (in megawatts) | MW | 22,840 | 24,349
Congestion revenue rights | Market simulation model and auction prices | Power prices | Minimum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value Inputs, price level ($ per MWh) | 3.65 | 0.00
Congestion revenue rights | Market simulation model and auction prices | Power prices | Maximum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value Inputs, price level ($ per MWh) | 99.58 | 110.44
Congestion revenue rights | Market simulation model and auction prices | Gas prices | Minimum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value Inputs, price level ($ per MWh) | 2.51 | 1.98
Congestion revenue rights | Market simulation model and auction prices | Gas prices | Maximum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value Inputs, price level ($ per MWh) | 4.87 | 5.72
Tolling | Option model |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value, Assets | $ | $ 0 | $ 10
Fair Value, Liabilities | $ | $ 1,154 | $ 1,297
Tolling | Option model | Power prices | Minimum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value Inputs, price level ($ per MWh) | 23.40 | 24.15
Expected volatility rate (as a percent) | 29.00% | 26.00%
Tolling | Option model | Power prices | Maximum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value Inputs, price level ($ per MWh) | 51.24 | 46.93
Expected volatility rate (as a percent) | 71.00% | 38.00%
Tolling | Option model | Power prices | Weighted Average |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value Inputs, price level ($ per MWh) | 34.70 | 34.80
Expected volatility rate (as a percent) | 40.00% | 30.00%
Tolling | Option model | Gas prices | Minimum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Expected volatility rate (as a percent) | 15.00% | 15.00%
Tolling | Option model | Gas prices | Maximum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Expected volatility rate (as a percent) | 48.00% | 58.00%
Tolling | Option model | Gas prices | Weighted Average |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Expected volatility rate (as a percent) | 20.00% | 20.00%

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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