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Compensation and Benefit Plans (Pension Plan Assets - Fair Value Levels) (Details) - Pension Plans - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross |  | $ 3,368 | $ 3,459 |
Receivables and payables, net |  | (70) | (5) |
Fair Value of Plan Assets |  | 3,298 | 3,454 | $ 3,477
Level 1 |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross |  | 971 | 984 |
Level 2 |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross |  | 2,183 | 2,186 |
Level 3 |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross |  | 214 | 289 |
Fair Value of Plan Assets |  | 214 | 289 | 390
U.S. government and agency securities |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross | [1] | 425 | 469 |
U.S. government and agency securities | Level 1 |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross | [1] | 127 | 140 |
U.S. government and agency securities | Level 2 |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross | [1] | 298 | 329 |
U.S. government and agency securities | Level 3 |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross | [1] | 0 | 0 |
Corporate stocks |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross | [2] | 736 | 730 |
Corporate stocks | Level 1 |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross | [2] | 720 | 716 |
Corporate stocks | Level 2 |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross | [2] | 16 | 14 |
Corporate stocks | Level 3 |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross | [2] | 0 | 0 |
Corporate bonds |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross | [3] | 755 | 801 |
Corporate bonds | Level 1 |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross | [3] | 0 | 0 |
Corporate bonds | Level 2 |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross | [3] | 755 | 801 |
Corporate bonds | Level 3 |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross | [3] | 0 | 0 |
Common/collective funds |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross | [4] | 640 | 524 |
Common/collective funds | Level 1 |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross | [4] | 0 | 0 |
Common/collective funds | Level 2 |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross | [4] | 640 | 524 |
Common/collective funds | Level 3 |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross | [4] | 0 | 0 |
Partnerships/joint ventures |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross | [5] | 325 | 399 |
Partnerships/joint ventures | Level 1 |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross | [5] | 0 | 0 |
Partnerships/joint ventures | Level 2 |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross | [5] | 111 | 110 |
Partnerships/joint ventures | Level 3 |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross | [5] | 214 | 289 |
Other investment entities |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross | [6] | 263 | 278 |
Other investment entities | Level 1 |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross | [6] | 0 | 0 |
Other investment entities | Level 2 |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross | [6] | 263 | 278 |
Other investment entities | Level 3 |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross | [6] | 0 | 0 |
Registered investment companies |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross | [7] | 121 | 143 |
Registered investment companies | Level 1 |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross | [7] | 117 | 113 |
Registered investment companies | Level 2 |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross | [7] | 4 | 30 |
Registered investment companies | Level 3 |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross | [7] | 0 | 0 |
Interest-bearing cash |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross |  | 6 | 10 |
Interest-bearing cash | Level 1 |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross |  | 6 | 10 |
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 |  | 97 | 105 |
Other | Level 1 |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross |  | 1 | 5 |
Other | Level 2 |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross |  | 96 | 100 |
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, percentage |  | 22.00% | 55.00% |
Non-index fund |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Performance percentage benchmark, percentage |  | 22.00% | 27.00% |
Collateralized mortgage obligations and other asset backed securities |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets, Gross |  | $ 123 | $ 102 |
Defined Benefit Plan, Fair Value of Plan Assets below Investment Grade |  | $ 25 | $ 15 |
Private Equity Funds Including Branded Consumer Products, Clean Technology and California Geographic Focus Companies | Level 3 |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Actual plan asset allocations, percentage |  | 78.00% | 45.00% |
Russell 200 and Russell 1000 indexes | Corporate stocks |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Performance percentage benchmark, percentage |  | 59.00% |  |
Russell 200 and Russell 1000 indexes | Undervalued Securities |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Performance percentage benchmark, percentage |  | 14.00% | 18.00% |
Morgan Stanley Capital International | Corporate stocks |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Performance percentage benchmark, percentage |  | 41.00% |  |
Standard And Poors 500 Index | Equity index fund |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Performance percentage benchmark, percentage |  | 46.00% | 32.00% |
Morgan Stanley Capital International Europe Australasia And Far East Index | Equity index fund |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Performance percentage benchmark, percentage |  | 16.00% | 20.00% |
Southern California Edison |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Fair Value of Plan Assets |  | $ 3,080 | $ 3,217 | $ 3,236
[1] | 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.
[2] | Corporate stocks are diversified. For both 2015 and 2014, performance for actively managed separate accounts is primarily benchmarked against the Russell Indexes (59%) and Morgan Stanley Capital International (MSCI) index (41%).
[3] | Corporate bonds are diversified. At December 31, 2015 and 2014, respectively, this category includes $123 million and $102 million for collateralized mortgage obligations and other asset backed securities of which $25 million and $15 million are below investment grade.
[4] | At December 31, 2015 and 2014, 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 (46% and 32%), Russell 1000 indexes (14% and 18%) and the MSCI Europe, Australasia and Far East (EAFE) Index (16% and 20%). A non-index U.S. equity fund representing 22% and 27% of this category for 2015 and 2014, respectively, is actively managed.
[5] | Partnerships/joint venture Level 2 investments consist primarily of a partnership which invests in publicly traded fixed income securities. At December 31, 2015 and 2014, respectively, 22% 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. At December 31, 2015 and 2014, respectively, 78% and 45% of the Level 3 partnerships are invested in private equity funds with investment strategies that include branded consumer products, clean technology and California geographic focus companies.
[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 securities.
[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 a short-term bond fund.

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