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Fair Value Measurements (Quantitative Information About Level 3 Fair Value Measurements) (Details) (Southern California Edison, Level 3, USD $) In Millions, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 MW | Dec. 31, 2013 MW
Congestion Revenue Rights | Market Simulation Model |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value, Assets | $ 339 | $ 366
Fair Value, Liabilities | 0 | 0
Congestion Revenue Rights | Market Simulation Model | Load Forecast | Minimum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair value inputs, power units (in megawatts) | 7,630 | 7,603
Congestion Revenue Rights | Market Simulation Model | Load Forecast | Maximum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair value inputs, power units (in megawatts) | 25,431 | 24,896
Congestion Revenue Rights | Market Simulation Model | Power Prices | Minimum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value Inputs, Price Level | 1.65 | (9.86)
Congestion Revenue Rights | Market Simulation Model | Power Prices | Maximum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value Inputs, Price Level | 109.95 | 108.56
Congestion Revenue Rights | Market Simulation Model | Gas Prices | Minimum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value Inputs, Price Level | 3.65 | 3.50
Congestion Revenue Rights | Market Simulation Model | Gas Prices | Maximum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value Inputs, Price Level | 6.53 | 7.10
Tolling | Option Model |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value, Assets | 0 | 5
Fair Value, Liabilities | $ 1,095 | $ 1,175
Tolling | Option Model | Power Prices | Minimum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value Inputs, Price Level | 36.80 | 38.00
Expected volatility rate (as a percent) | 26.00% | 25.00%
Tolling | Option Model | Power Prices | Maximum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value Inputs, Price Level | 65.60 | 63.90
Expected volatility rate (as a percent) | 45.00% | 45.00%
Tolling | Option Model | Power Prices | Weighted Average |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value Inputs, Price Level | 48.90 | 47.40
Expected volatility rate (as a percent) | 31.00% | 30.00%
Tolling | Option Model | Gas Prices | Minimum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Expected volatility rate (as a percent) | 12.00% | 16.00%
Tolling | Option Model | Gas Prices | Maximum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Expected volatility rate (as a percent) | 40.00% | 35.00%
Tolling | Option Model | Gas Prices | Weighted Average |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Expected volatility rate (as a percent) | 19.00% | 21.00%

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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=25499696&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 (e) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Fair value of financial and nonfinancial obligations. + 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=25499696&loc=d3e19207-110258 + Details
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