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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 |  |  | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Dec. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2011 | Dec. 31, 2013 Private bond | Dec. 31, 2012 Private bond | Dec. 31, 2013 Undervalued Securities | Dec. 31, 2012 Undervalued Securities | Dec. 31, 2013 Collateralized mortgage obligations and other asset backed securities | Dec. 31, 2012 Collateralized mortgage obligations and other asset backed securities | Dec. 31, 2013 Municipal Notes | Dec. 31, 2012 Municipal Notes | Dec. 31, 2013 Russell 200 and Russell 1000 indexes Corporate stocks | Dec. 31, 2012 Russell 200 and Russell 1000 indexes Corporate stocks | Dec. 31, 2013 Russell 1000 index Common or collective equity funds | Dec. 31, 2012 Russell 1000 index Common or collective equity funds | Dec. 31, 2013 Morgan Stanley Capital International Europe Australasia And Far East Index Equity index fund | Dec. 31, 2012 Morgan Stanley Capital International Europe Australasia And Far East Index Equity index fund | Dec. 31, 2013 MSCI All Country World Index Corporate stocks | Dec. 31, 2012 MSCI All Country World Index Corporate stocks | Dec. 31, 2013 Level 3 | Dec. 31, 2012 Level 3 | Dec. 31, 2011 Level 3 | Dec. 31, 2013 Level 3 Asset backed securities including distressed mortgages | Dec. 31, 2012 Level 3 Asset backed securities including distressed mortgages | Dec. 31, 2013 Southern California Edison | Dec. 31, 2012 Southern California Edison | Dec. 31, 2011 Southern California Edison | Dec. 31, 2013 Southern California Edison Common/collective funds | Dec. 31, 2012 Southern California Edison Common/collective funds | Dec. 31, 2013 Southern California Edison Corporate stocks | Dec. 31, 2012 Southern California Edison Corporate stocks | Dec. 31, 2013 Southern California Edison Corporate notes and bonds securities | Dec. 31, 2012 Southern California Edison Corporate notes and bonds securities | Dec. 31, 2013 Southern California Edison Partnerships/joint ventures | Dec. 31, 2012 Southern California Edison Partnerships/joint ventures | Dec. 31, 2013 Southern California Edison U.S. government and agency securities | Dec. 31, 2012 Southern California Edison U.S. government and agency securities | Dec. 31, 2013 Southern California Edison Registered investment companies | Dec. 31, 2012 Southern California Edison Registered investment companies | Dec. 31, 2013 Southern California Edison Interest-bearing cash | Dec. 31, 2012 Southern California Edison Interest-bearing cash | Dec. 31, 2013 Southern California Edison Other | Dec. 31, 2012 Southern California Edison Other | Dec. 31, 2013 Southern California Edison Level 1 | Dec. 31, 2012 Southern California Edison Level 1 | Dec. 31, 2013 Southern California Edison Level 1 Common/collective funds | Dec. 31, 2012 Southern California Edison Level 1 Common/collective funds | Dec. 31, 2013 Southern California Edison Level 1 Corporate stocks | Dec. 31, 2012 Southern California Edison Level 1 Corporate stocks | Dec. 31, 2013 Southern California Edison Level 1 Corporate notes and bonds securities | Dec. 31, 2012 Southern California Edison Level 1 Corporate notes and bonds securities | Dec. 31, 2013 Southern California Edison Level 1 Partnerships/joint ventures | Dec. 31, 2012 Southern California Edison Level 1 Partnerships/joint ventures | Dec. 31, 2013 Southern California Edison Level 1 U.S. government and agency securities | Dec. 31, 2012 Southern California Edison Level 1 U.S. government and agency securities | Dec. 31, 2013 Southern California Edison Level 1 Registered investment companies | Dec. 31, 2012 Southern California Edison Level 1 Registered investment companies | Dec. 31, 2013 Southern California Edison Level 1 Interest-bearing cash | Dec. 31, 2012 Southern California Edison Level 1 Interest-bearing cash | Dec. 31, 2013 Southern California Edison Level 1 Other | Dec. 31, 2012 Southern California Edison Level 1 Other | Dec. 31, 2013 Southern California Edison Level 2 | Dec. 31, 2012 Southern California Edison Level 2 | Dec. 31, 2013 Southern California Edison Level 2 Common/collective funds | Dec. 31, 2012 Southern California Edison Level 2 Common/collective funds | Dec. 31, 2013 Southern California Edison Level 2 Corporate stocks | Dec. 31, 2012 Southern California Edison Level 2 Corporate stocks | Dec. 31, 2013 Southern California Edison Level 2 Corporate notes and bonds securities | Dec. 31, 2012 Southern California Edison Level 2 Corporate notes and bonds securities | Dec. 31, 2013 Southern California Edison Level 2 Partnerships/joint ventures | Dec. 31, 2012 Southern California Edison Level 2 Partnerships/joint ventures | Dec. 31, 2013 Southern California Edison Level 2 U.S. government and agency securities | Dec. 31, 2012 Southern California Edison Level 2 U.S. government and agency securities | Dec. 31, 2013 Southern California Edison Level 2 Registered investment companies | Dec. 31, 2012 Southern California Edison Level 2 Registered investment companies | Dec. 31, 2013 Southern California Edison Level 2 Interest-bearing cash | Dec. 31, 2012 Southern California Edison Level 2 Interest-bearing cash | Dec. 31, 2013 Southern California Edison Level 2 Other | Dec. 31, 2012 Southern California Edison Level 2 Other | Dec. 31, 2013 Southern California Edison Level 3 | Dec. 31, 2012 Southern California Edison Level 3 | Dec. 31, 2013 Southern California Edison Level 3 Common/collective funds | Dec. 31, 2012 Southern California Edison Level 3 Common/collective funds | Dec. 31, 2013 Southern California Edison Level 3 Corporate stocks | Dec. 31, 2012 Southern California Edison Level 3 Corporate stocks | Dec. 31, 2013 Southern California Edison Level 3 Corporate notes and bonds securities | Dec. 31, 2012 Southern California Edison Level 3 Corporate notes and bonds securities | Dec. 31, 2013 Southern California Edison Level 3 Partnerships/joint ventures | Dec. 31, 2012 Southern California Edison Level 3 Partnerships/joint ventures | Dec. 31, 2013 Southern California Edison Level 3 U.S. government and agency securities | Dec. 31, 2012 Southern California Edison Level 3 U.S. government and agency securities | Dec. 31, 2013 Southern California Edison Level 3 Registered investment companies | Dec. 31, 2012 Southern California Edison Level 3 Registered investment companies | Dec. 31, 2013 Southern California Edison Level 3 Interest-bearing cash | Dec. 31, 2012 Southern California Edison Level 3 Interest-bearing cash | Dec. 31, 2013 Southern California Edison Level 3 Other | Dec. 31, 2012 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 |  |  |  |  |  |  |  |  |  | $ 76 | $ 73 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,063 | $ 1,841 |  | $ 863 | [1] | $ 723 | [1] | $ 451 | [2] | $ 361 | [2] | $ 250 | [3] | $ 210 | [3] | $ 184 | [4] | $ 183 | [4] | $ 154 | [5] | $ 162 | [5] | $ 57 | [6] | $ 68 | [6] | $ 19 | $ 24 | $ 85 | [7] | $ 110 | [7] | $ 647 | $ 590 | $ 0 | [1] | $ 0 | [1] | $ 451 | [2] | $ 361 | [2] | $ 0 | [3] | $ 0 | [3] | $ 0 | [4] | $ 0 | [4] | $ 118 | [5] | $ 131 | [5] | $ 52 | [6] | $ 68 | [6] | $ 19 | $ 24 | $ 7 | [7] | $ 6 | [7] | $ 1,252 | $ 1,085 | $ 863 | [1] | $ 723 | [1] | $ 0 | [2] | $ 0 | [2] | $ 250 | [3] | $ 210 | [3] | $ 20 | [4] | $ 17 | [4] | $ 36 | [5] | $ 31 | [5] | $ 5 | [6] | $ 0 | [6] | $ 0 | $ 0 | $ 78 | [7] | $ 104 | [7] | $ 164 | $ 166 | $ 0 | [1] | $ 0 | [1] | $ 0 | [2] | $ 0 | [2] | $ 0 | [3] | $ 0 | [3] | $ 164 | [4] | $ 166 | [4] | $ 0 | [5] | $ 0 | [5] | $ 0 | [6] | $ 0 | [6] | $ 0 | $ 0 | $ 0 | [7] | $ 0 | [7]
Receivables and payables, net |  |  |  |  |  |  |  | 29 | 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 | (41) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Fair Value of Plan Assets | $ 1,800 | $ 2,065 | $ 1,570 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 164 | $ 166 | $ 130 |  |  | $ 2,065 | $ 1,800 | $ 1,570 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance percentage benchmark |  |  |  |  |  |  |  |  |  |  |  | 50.00% | 50.00% | 60.00% | 60.00% | 23.00% | 23.00% | 50.00% | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Target asset allocation percentage of US equity securities | 41.00% |  |  | 6.00% | 6.00% | 7.00% | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actual plan asset allocations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 78.00% | 82.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | At December 31, 2013 and 2012, respectively, 60% and 60% 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 23% 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 7% 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 50%) and the MSCI All Country World (ACWI) index (50% and 50%) for 2013 and 2012, respectivel
[3] | Corporate notes and bonds are diversified and include approximately $29 million and $20 million for commercial collateralized mortgage obligations and other asset backed securities at December 31, 2013 and 2012, respectively.
[4] | At December 31, 2013 and 2012, respectively, 78% and 82% 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 $76 million and $73 million of municipal securities at December 31, 2013 and 2012, respectively.

X
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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 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: 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=29635418&loc=d3e12355-114930 + Details
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