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Compensation and Benefit Plans (Pension Plan Assets - Fair Value Levels) (Details) (Pension Plans, USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | ---
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | $ 3,580 |  | $ 3,192 |  |
Receivables and payables, net | (38) |  | (39) |  |
Fair Value of Plan Assets | 3,542 |  | 3,153 |  | 3,235
Level 1 |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 1,108 |  | 829 |  |
Level 2 |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 2,058 |  | 1,915 |  |
Level 3 |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 414 |  | 448 |  |
Fair Value of Plan Assets | 414 |  | 448 |  | 345
Corporate stocks |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 743 | [1] | 642 | [1] |
Corporate stocks | Level 1 |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 743 | [1] | 642 | [1] |
Corporate stocks | Level 2 |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 0 | [1] | 0 | [1] |
Corporate stocks | Level 3 |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 0 | [1] | 0 | [1] |
Partnerships/joint ventures |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 580 |  | 588 | [2] |
Partnerships/joint ventures | Level 1 |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 0 |  | 0 | [2] |
Partnerships/joint ventures | Level 2 |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 166 |  | 140 | [2] |
Partnerships/joint ventures | Level 3 |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 414 |  | 448 | [2] |
Common/collective funds |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 635 | [3] | 582 | [3] |
Common/collective funds | Level 1 |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 0 | [3] | 0 | [3] |
Common/collective funds | Level 2 |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 635 | [3] | 582 | [3] |
Common/collective funds | Level 3 |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 0 | [3] | 0 | [3] |
Corporate bonds |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 508 | [4] | 497 | [4] |
Corporate bonds | Level 1 |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 0 | [4] | 0 | [4] |
Corporate bonds | Level 2 |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 508 | [4] | 497 | [4] |
Corporate bonds | Level 3 |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 0 | [4] | 0 | [4] |
U.S. government and agency securities |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 592 | [5] | 455 | [5] |
U.S. government and agency securities | Level 1 |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 242 | [5] | 104 | [5] |
U.S. government and agency securities | Level 2 |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 350 | [5] | 351 | [5] |
U.S. government and agency securities | Level 3 |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 0 | [5] | 0 | [5] |
Other investment entities |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 271 | [6] | 247 | [6] |
Other investment entities | Level 1 |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 0 | [6] | 0 | [6] |
Other investment entities | Level 2 |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 271 | [6] | 247 | [6] |
Other investment entities | Level 3 |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 0 | [6] | 0 | [6] |
Registered investment companies |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 126 | [7] | 108 | [7] |
Registered investment companies | Level 1 |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 98 | [7] | 79 | [7] |
Registered investment companies | Level 2 |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 28 | [7] | 29 | [7] |
Registered investment companies | Level 3 |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 0 | [7] | 0 | [7] |
Interest-bearing cash |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 24 |  | 5 |  |
Interest-bearing cash | Level 1 |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 24 |  | 5 |  |
Interest-bearing cash | Level 2 |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 0 |  | 0 |  |
Interest-bearing cash | Level 3 |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 0 |  | 0 |  |
Other |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 101 |  | 68 |  |
Other | Level 1 |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 1 |  | (1) |  |
Other | Level 2 |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 100 |  | 69 |  |
Other | Level 3 |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 0 |  | 0 |  |
Asset backed securities including distressed mortgages | Level 3 |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Actual plan asset allocations | 56.00% |  | 55.00% |  |
Non-index fund |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Performance percentage benchmark | 25.00% |  | 23.00% |  |
Global asset allocation fund |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Actual plan asset allocations | 6.00% |  | 8.00% |  |
Collateralized mortgage obligations and other asset backed securities |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets, Gross | 65 |  | 53 |  |
Defined Benefit Plan, Fair Value of Plan Assets below Investment Grade | 7 |  | 10 |  |
Russell 200 and Russell 1000 indexes | Corporate stocks |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Performance percentage benchmark | 60.00% |  | 60.00% |  |
Russell 200 and Russell 1000 indexes | Undervalued Securities |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Performance percentage benchmark | 28.00% |  | 27.00% |  |
Morgan Stanley Capital International | Corporate stocks |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Performance percentage benchmark | 40.00% |  | 40.00% |  |
Standard And Poors 500 Index | Equity index fund |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Performance percentage benchmark | 29.00% |  | 29.00% |  |
Morgan Stanley Capital International Europe Australasia And Far East Index | Equity index fund |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Performance percentage benchmark | 11.00% |  | 10.00% |  |
Southern California Edison |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets | 3,320 |  | 2,971 |  | 3,066
Edison Mission Energy |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets | 215 |  | 177 |  |
Edison International Parent and Other |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets | $ 7 |  | $ 5 |  |
[1] | Corporate stocks are diversified. For 2012 and 2011, respectively, performance is primarily benchmarked against the Russell Indexes (60% and 60%) and Morgan Stanley Capital International (MSCI) index (40% and 40%).
[2] | Partnerships/joint venture Level 2 investments consist primarily of a partnership which invests in publicly traded fixed income securities, primarily from the banking and finance industry and U.S. government agencies. At December 31, 2012 and 2011, respectively, approximately 56% and 55% of the Level 3 partnerships are invested in (1) asset backed securities, including distressed mortgages and (2) commercial and residential loans and debt and equity of banks. The remaining Level 3 partnerships are invested in small private equity and venture capital funds. Investment strategies for these funds include branded consumer products, early stage technology, California geographic focus, and diversified US and non-US fund-of-funds.
[3] | At December 31, 2012 and 2011, respectively, the common/collective assets were invested in equity index funds that seek to track performance of the Standard and Poor's (S&P 500) Index (29% and 29%), Russell 200 and Russell 1000 indexes (28% and 27%) and the MSCI Europe, Australasia and Far East (EAFE) Index (11% and 10%). A non-index U.S. equity fund representing 25% and 23% of this category for 2012 and 2011, respectively, is actively managed. Another fund representing 6% and 8% of this category for 2012 and 2011, respectively, is a global asset allocation fund
[4] | Corporate bonds are diversified. At December 31, 2012 and 2011, respectively, this category includes $65 million and $53 million for collateralized mortgage obligations and other asset backed securities of which $7 million and $10 million are below investment grade.
[5] | Level 1 U.S. government and agency securities are U.S. treasury bonds and notes. Level 2 primarily relates to the Federal National Mortgage Association and the Federal Home Loan Mortgage Corporation
[6] | Other investment entities were primarily invested in (1) emerging market equity securities, (2) a hedge fund that invests through liquid instruments in a global diversified portfolio of equity, fixed income, interest rate, foreign currency and commodities markets, and (3) domestic mortgage backed securitie
[7] | Level 1 of registered investment companies primarily consisted of a global equity mutual fund which seeks to outperform the MSCI World Total Return Index. Level 2 primarily consisted of government inflation-indexed bonds and a short-term bond fund.

X
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- Definition The total of the fair value of plan asset categories, excluding other category of plan assets, which primarily include receivables and payables, net. + References No definition available. + Details
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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=6867990&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 49 -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 Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(iv)(b)(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. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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