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Compensation and Benefit Plans (Other Postretirement Plan Assets - Fair Value Levels) (Details) - Postretirement Benefits Other Than Pensions - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Net plan assets available for benefits | $ 2,102 | $ 2,036 | $ 2,086
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 | $ 47 | $ 27 |
Non-index U.S. equity fund |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Actual plan asset allocations, percentage | 18.00% | 17.00% |
Municipal Notes |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | $ 76 | $ 97 |
Russell 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 | 39.00% | 38.00% |
MSCI-EAFE | Equity index fund |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Performance percentage benchmark, percentage | 39.00% | 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% | 53.00% |
Level 3 | Private equity and venture capital funds including branded consumer products, clean and information technology and healthcare |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Actual plan asset allocations, percentage | 59.00% | 56.00% |
Level 3 | Broad range of financial assets in all global markets |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Actual plan asset allocations, percentage | 31.00% | 21.00% |
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 | 9.00% | 23.00% |
SCE |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | $ 2,133 | $ 2,060 |
Fair value NAV | 542 | 520 |
Receivables and payables, net | (31) | (24) |
Net plan assets available for benefits | 2,102 | 2,036 | $ 2,086
SCE | U.S. government and agency securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 281 | 242 |
Fair value NAV | 0 | 0 |
SCE | Corporate stocks |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 230 | 222 |
Fair value NAV | 0 | 0 |
SCE | Corporate notes and bonds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 877 | 867 |
Fair value NAV | 0 | 0 |
SCE | Common/collective funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 462 | 424 |
Fair value NAV | 462 | 424 |
SCE | Partnerships |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 79 | 93 |
Fair value NAV | 79 | 93 |
SCE | Registered investment companies |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 49 | 63 |
Fair value NAV | 1 | 3 |
SCE | Interest bearing cash |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 48 | 31 |
Fair value NAV | 0 | 0 |
SCE | Other |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 107 | 118 |
Fair value NAV | 0 | 0 |
SCE | Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 552 | 518 |
SCE | 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 | 222 | 200 |
SCE | Level 1 | Corporate stocks |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 230 | 222 |
SCE | Level 1 | Corporate notes and bonds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
SCE | Level 1 | Common/collective funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
SCE | Level 1 | Partnerships |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
SCE | Level 1 | Registered investment companies |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 48 | 60 |
SCE | Level 1 | Interest bearing cash |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 48 | 31 |
SCE | Level 1 | Other |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 4 | 5 |
SCE | Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 1,039 | 1,022 |
SCE | 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 | 59 | 42 |
SCE | Level 2 | Corporate stocks |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
SCE | Level 2 | Corporate notes and bonds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 877 | 867 |
SCE | Level 2 | Common/collective funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
SCE | Level 2 | Partnerships |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
SCE | Level 2 | Registered investment companies |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
SCE | Level 2 | Interest bearing cash |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
SCE | Level 2 | Other |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 103 | 113 |
SCE | Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
SCE | 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 | 0 | 0 |
SCE | Level 3 | Corporate stocks |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
SCE | Level 3 | Corporate notes and bonds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
SCE | Level 3 | Common/collective funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
SCE | Level 3 | Partnerships |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
SCE | Level 3 | Registered investment companies |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
SCE | Level 3 | Interest bearing cash |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
SCE | Level 3 | Other |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | $ 0 | $ 0 |

X
- Definition The total of the fair value of plan asset categories, excluding other category of plan assets, which primarily include receivables and payables, net. + References No definition available. + Details
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