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Compensation and Benefit Plans (Changes in Plan Assets and Benefits Obligations Recognized in OCI) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Postretirement Benefits Other Than Pensions |  |  |  |
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Unrecognized prior service cost to be amortized |  | $ (3) |  |
Pension Plans |  |  |  |
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Net loss (gain) |  | 7 | $ 85 | $ (33)
Amortization of net loss and other |  | (15) | (13) | (13)
Total recognized in other comprehensive loss |  | (8) | 72 | (46)
Total recognized in expense and other comprehensive loss |  | 110 | 223 | 142
Unrecognized net loss to be amortized | [1] | 36 |  |
Unrecognized prior service cost to be amortized |  | 4 |  |
Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year |  | 11 |  |
Southern California Edison | Postretirement Benefits Other Than Pensions |  |  |  |
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Unrecognized prior service cost to be amortized |  | (3) |  |
Southern California Edison | Pension Plans |  |  |  |
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Net loss (gain) |  | (9) | 37 | (24)
Amortization of net loss and other |  | (9) | (4) | (7)
Total recognized in other comprehensive loss |  | (18) | 33 | (31)
Total recognized in expense and other comprehensive loss |  | 93 | $ 174 | $ 145
Unrecognized net loss to be amortized | [1] | 32 |  |
Unrecognized prior service cost to be amortized |  | 4 |  |
Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year |  | $ 6 |  |
[1] | The amount of net loss expected to be reclassified from other comprehensive loss for Edison International's continuing operations and SCE is $11 million and $6 million, respectively.

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