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Compensation and Benefit Plans (Other Postretirement Plan Assets - Fair Value Levels) (Details) - Postretirement Benefits Other Than Pensions - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair Value of Plan Assets |  | $ 2,036 | $ 2,086 | $ 2,065
Undervalued Securities |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target asset allocation percentage of US equity securities |  | 17.00% |  |
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 |  | $ 27 | 31 |
Municipal Notes |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair Value of Plan Assets, Gross |  | $ 97 | 111 |
Russell 200 and Russell 1000 indexes | Corporate stocks |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Performance percentage benchmark, percentage |  | 47.00% |  |
Russell 1000 index | Common or collective equity funds |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Performance percentage benchmark, percentage |  | 38.00% |  |
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, percentage |  | 41.00% |  |
MSCI All Country World Index | Corporate stocks |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Performance percentage benchmark, percentage |  | 53.00% |  |
Level 3 |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair Value of Plan Assets |  | $ 74 | $ 105 | 164
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, percentage |  | 29.00% | 50.00% |
Level 3 | Private Equity Funds Including Branded Consumer Products, Clean Technology and California Geographic Focus Companies |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Actual plan asset allocations, percentage |  | 71.00% | 50.00% |
Southern California Edison |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair Value of Plan Assets, Gross |  | $ 2,060 | $ 2,159 |
Receivables and payables, net |  | (24) | (73) |
Fair Value of Plan Assets |  | 2,036 | 2,086 | $ 2,065
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 | [1] | 424 | 431 |
Southern California Edison | Corporate stocks |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair Value of Plan Assets, Gross | [2] | 222 | 250 |
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 | [3] | 867 | 883 |
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 | [4] | 93 | 124 |
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 | [5] | 242 | 243 |
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 | [6] | 63 | 69 |
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 |  | 31 | 29 |
Southern California Edison | Other |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair Value of Plan Assets, Gross | [7] | 118 | 130 |
Southern California Edison | Level 1 |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair Value of Plan Assets, Gross |  | 518 | 555 |
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 | [1] | 0 | 0 |
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 | [2] | 222 | 250 |
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 | [3] | 0 | 0 |
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 | [4] | 0 | 0 |
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 | [5] | 200 | 207 |
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 | [6] | 60 | 64 |
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 |  | 31 | 29 |
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 | [7] | 5 | 5 |
Southern California Edison | Level 2 |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair Value of Plan Assets, Gross |  | 1,469 | 1,499 |
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 | [1] | 424 | 431 |
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 | [2] | 0 | 0 |
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 | [3] | 867 | 883 |
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 | [4] | 20 | 19 |
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 | [5] | 42 | 36 |
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 | [6] | 3 | 5 |
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 | [7] | 113 | 125 |
Southern California Edison | Level 3 |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair Value of Plan Assets, Gross |  | 73 | 105 |
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 | [1] | 0 | 0 |
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 | [2] | 0 | 0 |
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 | [3] | 0 | 0 |
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 | [4] | 73 | 105 |
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 | [5] | 0 | 0 |
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 | [6] | 0 | 0 |
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 | [7] | $ 0 | $ 0 |
[1] | At both December 31, 2015 and 2014, 38% of the common/collective assets are invested in a large cap index fund which seeks to track performance of the Russell 1000 index. 41% of the assets in this category are in index funds which seek to track performance in the MSCI All Country World Index Investable Market Index and MSCI Europe, Australasia and Far East (EAFE) Index. 17% in a non-index U.S. equity fund which is actively managed.
[2] | Corporate stock performance for actively managed separate accounts is primarily benchmarked against the Russell Indexes (47%) and the MSCI All Country World Index (53%) for both 2015 and 2014.
[3] | Corporate notes and bonds are diversified and include approximately $27 million and $31 million for commercial collateralized mortgage obligations and other asset backed securities at December 31, 2015 and 2014, respectively.
[4] | At December 31, 2015 and 2014, respectively, 29% and 50% 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. At December 31, 2015 and 2014, respectively, 71% and 50% of the Level 3 partnerships are invested in private equity and venture capital funds. Investment strategies for these funds include branded consumer products, clean and information technology and healthcare.
[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 a money market fund.
[7] | Other includes $97 million and $111 million of municipal securities at December 31, 2015 and 2014, respectively.

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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=49178875&loc=d3e12355-114930 Reference 2: 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=58740216&loc=d3e1928-114920 + Details
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