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Compensation and Benefit Plans (Other Postretirement Plan Assets - Fair Value Levels) (Details) (Postretirement Benefits Other Than Pensions, USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Net Fair Value of Plan Assets | $ 1,800 |  | $ 1,570 |  | $ 1,606
Target asset allocation percentage of US equity securities | 41.00% |  | 41.00% |  |
Private bond |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Target asset allocation percentage of US equity securities | 6.00% |  | 6.00% |  |
Undervalued Securities |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Target asset allocation percentage of US equity securities | 6.00% |  | 6.00% |  |
Collateralized mortgage obligations and other asset backed securities |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Receivables and payables, net | 20 |  | 14 |  |
Municipal Notes |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 73 |  | 60 |  |
Russell 200 and Russell 1000 indexes | Corporate stocks |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Performance percentage benchmark | 50.00% |  | 53.00% |  |
Russell 1000 index | Common or collective equity funds |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Performance percentage benchmark | 60.00% |  | 63.00% |  |
Morgan Stanley Capital International Europe Australasia And Far East Index | Equity index fund |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Performance percentage benchmark | 23.00% |  | 21.00% |  |
MSCI All Country World Index | Corporate stocks |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Performance percentage benchmark | 50.00% |  | 47.00% |  |
Level 3 |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Net Fair Value of Plan Assets | 166 |  | 130 |  | 92
Level 3 | Asset backed securities including distressed mortgages |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Actual plan asset allocations | 82.00% |  | 81.00% |  |
Southern California Edison |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 1,841 |  | 1,593 |  |
Receivables and payables, net | (41) |  | (23) |  |
Net Fair Value of Plan Assets | 1,800 |  | 1,570 |  | 1,606
Southern California Edison | Common/collective funds |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 723 | [1] | 642 | [1] |
Southern California Edison | Corporate stocks |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 361 | [2] | 319 | [2] |
Southern California Edison | Corporate notes and bonds securities |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 210 | [3] | 177 | [3] |
Southern California Edison | Partnerships/joint ventures |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 183 | [4] | 146 | [4] |
Southern California Edison | U.S. government and agency securities |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 162 | [5] | 142 | [5] |
Southern California Edison | Registered investment companies |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 68 | [6] | 80 | [6] |
Southern California Edison | Interest-bearing cash |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 24 |  | 12 |  |
Southern California Edison | Other |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 110 | [7] | 75 | [7] |
Southern California Edison | Level 1 |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 590 |  | 515 |  |
Southern California Edison | Level 1 | Common/collective funds |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 0 | [1] | 0 | [1] |
Southern California Edison | Level 1 | Corporate stocks |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 361 | [2] | 319 | [2] |
Southern California Edison | Level 1 | Corporate notes and bonds securities |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 0 | [3] | 0 | [3] |
Southern California Edison | Level 1 | Partnerships/joint ventures |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 0 | [4] | 0 | [4] |
Southern California Edison | Level 1 | U.S. government and agency securities |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 131 | [5] | 100 | [5] |
Southern California Edison | Level 1 | Registered investment companies |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 68 | [6] | 80 | [6] |
Southern California Edison | Level 1 | Interest-bearing cash |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 24 |  | 12 |  |
Southern California Edison | Level 1 | Other |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 6 | [7] | 4 | [7] |
Southern California Edison | Level 2 |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 1,085 |  | 948 |  |
Southern California Edison | Level 2 | Common/collective funds |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 723 | [1] | 642 | [1] |
Southern California Edison | Level 2 | Corporate stocks |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 0 | [2] | 0 | [2] |
Southern California Edison | Level 2 | Corporate notes and bonds securities |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 210 | [3] | 177 | [3] |
Southern California Edison | Level 2 | Partnerships/joint ventures |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 17 | [4] | 16 | [4] |
Southern California Edison | Level 2 | U.S. government and agency securities |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 31 | [5] | 42 | [5] |
Southern California Edison | Level 2 | Registered investment companies |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 0 | [6] | 0 | [6] |
Southern California Edison | Level 2 | Interest-bearing cash |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 0 |  | 0 |  |
Southern California Edison | Level 2 | Other |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 104 | [7] | 71 | [7] |
Southern California Edison | Level 3 |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 166 |  | 130 |  |
Southern California Edison | Level 3 | Common/collective funds |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 0 | [1] | 0 | [1] |
Southern California Edison | Level 3 | Corporate stocks |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 0 | [2] | 0 | [2] |
Southern California Edison | Level 3 | Corporate notes and bonds securities |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 0 | [3] | 0 | [3] |
Southern California Edison | Level 3 | Partnerships/joint ventures |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 166 | [4] | 130 | [4] |
Southern California Edison | Level 3 | U.S. government and agency securities |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 0 | [5] | 0 | [5] |
Southern California Edison | Level 3 | Registered investment companies |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 0 | [6] | 0 | [6] |
Southern California Edison | Level 3 | Interest-bearing cash |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 0 |  | 0 |  |
Southern California Edison | Level 3 | Other |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | $ 0 | [7] | $ 0 | [7] |
[1] | At December 31, 2012 and 2011, respectively, 60% and 63% of the common/collective assets are invested in a large cap index fund which seeks to track performance of the Russell 1000 index. 23% and 21% of the assets in this category are in index funds which seek to track performance in the MSCI Europe, Australasia and Far East (EAFE) Index. 6% and 6% of this category are invested in a privately managed bond fund and 6% and 6% in a fund which invests in equity securities the fund manager believes are undervalue
[2] | Corporate stock performance is primarily benchmarked against the Russell Indexes (50% and 53%) and the MSCI All Country World (ACWI) index (50% and 47%) for 2012 and 2011, respectivel
[3] | Corporate notes and bonds are diversified and include approximately $20 million and $14 million for commercial collateralized mortgage obligations and other asset backed securities at December 31, 2012 and 2011, respectively.
[4] | At December 31, 2012 and 2011, respectively, 82% and 81% of the Level 3 partnerships category is invested in (1) asset backed securities including distressed mortgages, (2) distressed companies and (3) commercial and residential loans and debt and equity of banks.
[5] | Level 1 U.S. government and agency securities are U.S. treasury bonds and notes. Level 2 primarily relates to the Federal Home Loan Mortgage Corporation and the Federal National Mortgage Association.
[6] | Level 1 registered investment companies consist of an investment grade corporate bond mutual fund and a money market fund.
[7] | Other includes $73 million and $60 million of municipal securities at December 31, 2012 and 2011, respectively.

X
- 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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X
- Definition Target allocation percentage of investments in U.S. equity securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position. + 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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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(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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