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Commitments and Contingencies (Schedule of Estimated Losses) (Details) - USD ($) $ in Millions |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 12 Months Ended | 37 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 22, 2021 | Jan. 31, 2021 | Oct. 31, 2020 | Sep. 30, 2020 | Feb. 18, 2021 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Loss Contingency Accrual [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Wildfire-related claims |  |  |  |  |  |  |  |  |  | $ 2,231 | $ 0
Woolsey Fire |  |  |  |  |  |  |  |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ 2,152 |  |  | $ 2,152 |  |  |  |  |  |
Ending balance |  |  |  |  |  |  | $ 2,152 |  | $ 2,152 |  |
Loss contingency accrual |  | 2,152 |  |  | 2,152 |  | 2,152 |  | 2,152 | 2,152 |
Woolsey Fire | Subsequent event |  |  |  |  |  |  |  |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Litigation settlement | $ 2,212 |  |  |  |  |  |  |  |  |  |
2017/2018 Wildfire/Mudslide Events |  |  |  |  |  |  |  |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 4,400 |  |  | 4,400 |  |  |  |  |  |
Ending balance |  |  |  |  |  |  | 4,400 |  | 4,400 |  |
Loss contingency accrual |  | 4,400 |  |  | 4,400 |  | 4,400 |  | 4,400 | 4,400 |
2017/2018 Wildfire/Mudslide Events | Subsequent event |  |  |  |  |  |  |  |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Litigation settlement | 19 |  |  |  |  |  |  |  |  |  |
Other wildfire-related claims |  |  |  |  |  |  |  |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 129 |  |  | 129 |  |  |  |  |  |
Ending balance |  |  |  |  |  |  | 129 |  | 129 |  |
Loss contingency accrual |  | 129 |  |  | 129 |  | 129 |  | 129 | 129 |
2017/2018 Wildfire/Mudslide Events |  |  |  |  |  |  |  |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 4,400 |  |  | 4,400 |  | 4,500 |  |  |  |
Increase in accrued estimated losses to reflect best estimate |  |  |  | $ 1,300 |  |  |  |  |  |  |
Ending balance |  |  |  |  |  | $ 4,500 | 4,400 | $ 4,500 | 4,400 |  |
Loss contingency accrual |  | 4,400 |  |  | 4,400 | 4,500 | 4,500 | 4,500 | 4,400 | 4,400 | 4,500
Loss Contingency Accrual, Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |
Charge for wildfire-related claims |  |  |  | 1,300 |  |  |  |  |  |  |
2017/2018 Wildfire/Mudslide Events | Deferred credits and other liabilities |  |  |  |  |  |  |  |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 2,281 |  |  | 2,281 |  |  |  |  |  |
Ending balance |  |  |  |  |  |  | 2,281 |  | 2,281 |  |
Loss contingency accrual |  | 2,281 |  |  | 2,281 |  | 2,281 |  | 2,281 | 2,281 |
SCE |  |  |  |  |  |  |  |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Wildfire-related claims |  |  |  |  |  |  |  |  |  | 2,231 | 0
SCE | Woolsey Fire |  |  |  |  |  |  |  |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 2,152 |  |  | 2,152 |  |  |  |  |  |
Ending balance |  |  |  |  |  |  | 2,152 |  | 2,152 |  |
Loss contingency accrual |  | 2,152 |  |  | 2,152 |  | 2,152 |  | 2,152 | 2,152 |
SCE | Woolsey Fire | Subsequent event |  |  |  |  |  |  |  |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Litigation settlement | 2,212 |  |  |  |  |  |  |  |  |  |
SCE | 2017/2018 Wildfire/Mudslide Events |  |  |  |  |  |  |  |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 4,400 |  |  | 4,400 |  |  |  |  |  |
Ending balance |  |  |  |  |  |  | 4,400 |  | 4,400 |  |
Loss contingency accrual |  | 4,400 |  |  | 4,400 |  | 4,400 |  | 4,400 | 4,400 |
SCE | 2017/2018 Wildfire/Mudslide Events | Subsequent event |  |  |  |  |  |  |  |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Litigation settlement | $ 19 |  |  |  |  |  |  |  |  |  |
SCE | Other wildfire-related claims |  |  |  |  |  |  |  |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 129 |  |  | 129 |  |  |  |  |  |
Ending balance |  |  |  |  |  |  | 129 |  | 129 |  |
Loss contingency accrual |  | 129 |  |  | 129 |  | 129 |  | 129 | 129 |
SCE | 2017/2018 Wildfire/Mudslide Events |  |  |  |  |  |  |  |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 4,383 |  |  | 4,383 |  | 4,541 |  |  |  |
Increase in accrued estimated losses to reflect best estimate |  |  |  | 1,300 |  |  | 1,297 | 232 | 6,200 |  |
Amounts paid |  |  | $ (1,200) |  |  | (360) | (1,455) |  |  |  |
Ending balance |  |  |  |  |  | 4,541 | 4,383 | 4,541 | 4,383 |  |
Litigation settlement |  |  |  |  |  |  | 300 |  |  |  |
Loss contingency accrual |  | 4,383 |  |  | 4,383 | $ 4,541 | 4,383 | 4,541 | 4,383 | 4,383 | $ 4,541
Loss Contingency Accrual, Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |
Charge for wildfire-related claims |  |  |  | $ 1,300 |  |  | 1,297 | 232 | 6,200 |  |
Expected revenue from FERC customers |  |  |  |  |  |  | (84) | (14) |  |  |
Total pre-tax charge |  |  |  |  |  |  | 1,213 | 218 |  |  |
Income tax benefit |  |  |  |  |  |  | (339) | (61) |  |  |
Total after-tax charge |  |  |  |  |  |  | 874 | $ 157 |  |  |
SCE | 2017/2018 Wildfire/Mudslide Events | Deferred credits and other liabilities |  |  |  |  |  |  |  |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 2,281 |  |  | 2,281 |  |  |  |  |  |
Ending balance |  |  |  |  |  |  | 2,281 |  | 2,281 |  |
Loss contingency accrual |  | 2,281 |  |  | 2,281 |  | $ 2,281 |  | $ 2,281 | $ 2,281 |
SCE | 2017/2018 Wildfire/Mudslide Events | Subsequent event |  |  |  |  |  |  |  |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Amounts paid |  | $ (2,200) |  |  |  |  |  |  |  |  |
Litigation settlement |  |  |  |  | $ 80 |  |  |  |  |  |

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