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Compensation and Benefit Plans (Pension Plan Assets - Fair Value Levels) (Details) - Pension Plans - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | $ 3,548 | $ 3,368 |
Fair value NAV | 1,284 | 1,232 |
Receivables and payables, net | (160) | (70) |
Net plan assets available for benefits | 3,388 | 3,298 | $ 3,454
Level 1 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 1,103 | 971 |
Level 2 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 1,161 | 1,165 |
Level 3 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
U.S. government and agency securities |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 526 | 425 |
Fair value NAV | 0 | 0 |
U.S. government and agency securities | Level 1 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 217 | 127 |
U.S. government and agency securities | Level 2 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 309 | 298 |
U.S. government and agency securities | Level 3 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
Corporate stocks |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 735 | 736 |
Fair value NAV | $ 0 | $ 0 |
Corporate stocks | Russell Indexes |  |  |
Pension and Other Postretirement Benefits |  |  |
Performance percentage benchmark, percentage | 62.00% | 59.00% |
Corporate stocks | MSCI |  |  |
Pension and Other Postretirement Benefits |  |  |
Performance percentage benchmark, percentage | 38.00% | 41.00% |
Corporate stocks | Level 1 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | $ 720 | $ 720 |
Corporate stocks | Level 2 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 15 | 16 |
Corporate stocks | Level 3 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
Corporate bonds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 725 | 755 |
Fair value NAV | 0 | 0 |
Corporate bonds | Level 1 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
Corporate bonds | Level 2 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 725 | 755 |
Corporate bonds | Level 3 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
Common/collective funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 692 | 640 |
Fair value NAV | 692 | 640 |
Common/collective funds | Level 1 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
Common/collective funds | Level 2 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
Common/collective funds | Level 3 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
Partnerships/joint ventures |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 333 | 325 |
Fair value NAV | 333 | 325 |
Partnerships/joint ventures | Level 1 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
Partnerships/joint ventures | Level 2 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
Partnerships/joint ventures | Level 3 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
Other investment entities |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 253 | 263 |
Fair value NAV | 253 | 263 |
Other investment entities | Level 1 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
Other investment entities | Level 2 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
Other investment entities | Level 3 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
Registered investment companies |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 130 | 121 |
Fair value NAV | 6 | 4 |
Registered investment companies | Level 1 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 124 | 117 |
Registered investment companies | Level 2 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
Registered investment companies | Level 3 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
Interest-bearing cash |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 42 | 6 |
Fair value NAV | 0 | 0 |
Interest-bearing cash | Level 1 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 42 | 6 |
Interest-bearing cash | Level 2 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
Interest-bearing cash | Level 3 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
Other |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 112 | 97 |
Fair value NAV | 0 | 0 |
Other | Level 1 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 1 |
Other | Level 2 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 112 | 96 |
Other | Level 3 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
Collateralized mortgage obligations and other asset backed securities |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 76 | 123 |
Mortgage obligations and other asset backed securities, below investment grade | $ 27 | $ 25 |
Equity index fund | S&P 500 |  |  |
Pension and Other Postretirement Benefits |  |  |
Performance percentage benchmark, percentage | 45.00% | 46.00% |
Equity index fund | MSCI All Country World Index exUS |  |  |
Pension and Other Postretirement Benefits |  |  |
Performance percentage benchmark, percentage | 15.00% |  |
Equity index fund | MSCI-EAFE |  |  |
Pension and Other Postretirement Benefits |  |  |
Performance percentage benchmark, percentage |  | 16.00% |
Undervalued Securities | Russell Indexes |  |  |
Pension and Other Postretirement Benefits |  |  |
Performance percentage benchmark, percentage | 15.00% | 14.00% |
Non-index fund |  |  |
Pension and Other Postretirement Benefits |  |  |
Performance percentage benchmark, percentage | 23.00% | 22.00% |
Asset backed securities including distressed mortgages | Level 3 |  |  |
Pension and Other Postretirement Benefits |  |  |
Actual plan asset allocations, percentage | 4.00% | 15.00% |
Private equity and venture capital funds including branded consumer products, clean and information technology and healthcare | Level 3 |  |  |
Pension and Other Postretirement Benefits |  |  |
Actual plan asset allocations, percentage | 55.00% | 51.00% |
Publicly traded fixed income securities | Level 3 |  |  |
Pension and Other Postretirement Benefits |  |  |
Actual plan asset allocations, percentage | 22.00% | 20.00% |
Broad range of financial assets in all global markets | Level 3 |  |  |
Pension and Other Postretirement Benefits |  |  |
Actual plan asset allocations, percentage | 18.00% | 14.00% |
SCE |  |  |
Pension and Other Postretirement Benefits |  |  |
Net plan assets available for benefits | $ 3,172 | $ 3,080 | $ 3,217

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