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Compensation and Benefit Plans (Supplemental Data on Stock-Based Compensation) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense | $ 35 | [1] | $ 30 | [1] | $ 35 | [1]
Income tax benefits related to stock compensation expense | 14 |  | 12 |  | 13 |
Excess tax benefits (expense) | (6) | [2] | 12 | [2] | 7 | [2]
Weighted average grant date fair value per option granted (dollars per share) | $ 5.22 |  | $ 5.61 |  | $ 4.89 |
Fair value of options vested | 17 |  | 18 |  | 18 |
Cash used to purchase shares to settle options | 169 |  | 90 |  | 61 |
Cash from participants to exercise stock options | 101 |  | 59 |  | 38 |
Value of options exercised | 68 |  | 31 |  | 23 |
Tax benefits from options exercised | 27 |  | 12 |  | 9 |
Employee Stock Option |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense | 18 | [1] | 14 | [1] | 14 | [1]
Performance Shares |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense | 7 | [1] | 5 | [1] | 8 | [1]
Restricted Stock Units (RSUs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense | 9 | [1] | 6 | [1] | 6 | [1]
Weighted average grant date fair value per share granted (dollars per share) | $ 43.17 |  | $ 38.01 |  | $ 32.12 |
Values of shares settled | 7 |  | 6 |  | 0 |
Tax benefits realized from settlement of awards | 3 |  | 3 |  | 0 |
Other Stock Awards |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense | 1 | [1] | 5 | [1] | 7 | [1]
Performance Benefits Classified As Equity Awards |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Weighted average grant date fair value per share granted (dollars per share) | $ 51.43 |  | $ 29.97 |  | $ 32.25 |
Fair value of shares vested | 4 |  | 4 |  | 4 |
Values of shares settled | 4 |  | 0 |  | 0 |
Tax benefits realized from settlement of awards | 2 |  | 0 |  | 0 |
Performance Shares Classified As Liability Awards |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Values of shares settled | 4 |  | 0 |  | 0 |
Tax benefits realized from settlement of awards | 2 |  | 0 |  | 0 |
Southern California Edison |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense | 19 | [1] | 20 | [1] | 27 | [1]
Income tax benefits related to stock compensation expense | 8 |  | 8 |  | 11 |
Excess tax benefits (expense) | (13) | [2] | 11 | [2] | 4 | [2]
Weighted average grant date fair value per option granted (dollars per share) | $ 5.22 |  | $ 5.61 |  | $ 4.87 |
Fair value of options vested | 10 |  | 10 |  | 11 |
Cash used to purchase shares to settle options | 96 |  | 46 |  | 27 |
Cash from participants to exercise stock options | 59 |  | 28 |  | 18 |
Value of options exercised | 37 |  | 18 |  | 9 |
Tax benefits from options exercised | 15 |  | 7 |  | 4 |
Southern California Edison | Employee Stock Option |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense | 10 | [1] | 9 | [1] | 10 | [1]
Southern California Edison | Performance Shares |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense | 4 | [1] | 3 | [1] | 6 | [1]
Southern California Edison | Restricted Stock Units (RSUs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense | 5 | [1] | 4 | [1] | 5 | [1]
Weighted average grant date fair value per share granted (dollars per share) | $ 43.20 |  | $ 38.07 |  | $ 33.38 |
Values of shares settled | 4 |  | 5 |  | 0 |
Tax benefits realized from settlement of awards | 2 |  | 2 |  | 0 |
Southern California Edison | Other Stock Awards |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense | 0 | [1] | 4 | [1] | 6 | [1]
Southern California Edison | Performance Benefits Classified As Equity Awards |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Weighted average grant date fair value per share granted (dollars per share) | $ 51.48 |  | $ 29.40 |  | $ 32.19 |
Fair value of shares vested | 3 |  | 2 |  | 3 |
Values of shares settled | 2 |  | 0 |  | 0 |
Tax benefits realized from settlement of awards | 1 |  | 0 |  | 0 |
Southern California Edison | Performance Shares Classified As Liability Awards |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Values of shares settled | 2 |  | 0 |  | 0 |
Tax benefits realized from settlement of awards | $ 1 |  | $ 0 |  | $ 0 |
[1] | Reflected in "Operations and maintenance" on Edison International's and SCE's consolidated statements of income.
[2] | Reflected in "Settlements of stock-based compensation, net" in the financing section of Edison International's and SCE's consolidated statements of cash flows.

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph i -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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