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Compensation and Benefit Plans (Pension Plan Assets - Fair Value Levels) (Details) - Pension Plans - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | $ 3,714 | $ 3,548 |
Fair value NAV | 1,363 | 1,284 |
Receivables and payables, net | (98) | (160) |
Net plan assets available for benefits | 3,616 | 3,388 | $ 3,298
Level 1 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 1,051 | 1,103 |
Level 2 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 1,300 | 1,161 |
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 | 691 | 526 |
Fair value NAV | 0 | 0 |
U.S. government and agency securities | Level 1 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 184 | 217 |
U.S. government and agency securities | Level 2 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 507 | 309 |
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 | 729 | 735 |
Fair value NAV | $ 0 | $ 0 |
Corporate stocks | Russell Indexes |  |  |
Pension and Other Postretirement Benefits |  |  |
Performance percentage benchmark, percentage | 54.00% | 62.00% |
Corporate stocks | MSCI |  |  |
Pension and Other Postretirement Benefits |  |  |
Performance percentage benchmark, percentage | 46.00% | 38.00% |
Corporate stocks | Level 1 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | $ 718 | $ 720 |
Corporate stocks | Level 2 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 11 | 15 |
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 | 676 | 725 |
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 | 676 | 725 |
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 | 705 | 692 |
Fair value NAV | $ 705 | $ 692 |
Common/collective funds | Standard and Poor's 500 |  |  |
Pension and Other Postretirement Benefits |  |  |
Performance percentage benchmark, percentage | 41.00% | 45.00% |
Common/collective funds | Russell 1000 index |  |  |
Pension and Other Postretirement Benefits |  |  |
Performance percentage benchmark, percentage | 15.00% | 15.00% |
Common/collective funds | MSCI All Country World Index exUS |  |  |
Pension and Other Postretirement Benefits |  |  |
Performance percentage benchmark, percentage | 15.00% | 15.00% |
Common/collective funds | Non-index U.S. equity fund |  |  |
Pension and Other Postretirement Benefits |  |  |
Performance percentage benchmark, percentage | 25.00% | 23.00% |
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 | 396 | 333 |
Fair value NAV | $ 396 | $ 333 |
Partnerships/joint ventures | Private equity and venture capital funds including branded consumer products, clean and information technology and healthcare |  |  |
Pension and Other Postretirement Benefits |  |  |
Actual plan asset allocations, percentage | 55.00% | 55.00% |
Partnerships/joint ventures | Publicly traded fixed income securities |  |  |
Pension and Other Postretirement Benefits |  |  |
Actual plan asset allocations, percentage | 23.00% | 22.00% |
Partnerships/joint ventures | Broad range of financial assets in all global markets |  |  |
Pension and Other Postretirement Benefits |  |  |
Actual plan asset allocations, percentage | 20.00% | 18.00% |
Partnerships/joint ventures | Asset backed securities including distressed mortgages |  |  |
Pension and Other Postretirement Benefits |  |  |
Actual plan asset allocations, percentage | 2.00% | 4.00% |
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 | 262 | 253 |
Fair value NAV | 262 | 253 |
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 | 140 | 130 |
Fair value NAV | 0 | 6 |
Registered investment companies | Level 1 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 140 | 124 |
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 | 9 | 42 |
Fair value NAV | 0 | 0 |
Interest-bearing cash | Level 1 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 9 | 42 |
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 | 106 | 112 |
Fair value NAV | 0 | 0 |
Other | Level 1 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
Other | Level 2 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 106 | 112 |
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 | 65 | 76 |
Mortgage obligations and other asset backed securities, below investment grade | 18 | 27 |
SCE |  |  |
Pension and Other Postretirement Benefits |  |  |
Net plan assets available for benefits | $ 3,390 | $ 3,172 | $ 3,080

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