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Regulatory Assets and Liabilities (Balancing Accounts) (Details) - SCE - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Regulatory Assets and Liabilities |  |  |
Environmental remediation expense | $ 6 | $ 5 |
Significant components |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) | 2,018 |  | $ 1,388
Energy resource recovery account |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) | 348 |  | (89)
Portfolio allocation balancing account |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) | 98 |  | 497
New system generation balancing account |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) | 57 |  | (10)
Public purpose programs and energy efficiency programs |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) | (1,174) |  | (1,130)
Base revenue requirement balancing account |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) | 784 |  | 622
GRC wildfire mitigation balancing accounts |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) | 48 |  |
Residential uncollectibles balancing account |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) | 209 |  |
Greenhouse gas auction revenue and low carbon fuel standard revenue |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) | (254) |  | (125)
FERC balancing account |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) | 3 |  | 12
Wildfire and drought restoration accounts |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) | 287 |  | 361
Wildfire-related memorandum accounts |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) | 1,274 |  | 1,104
Revenue recognized | 326 |  |
COVID 19-related memorandum accounts |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) | 86 |  | 176
Customer service re-platform memorandum account |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) | 101 |  | 30
Tax accounting memorandum account and pole loading balancing account |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) | 204 |  | (35)
Other |  |  |
Regulatory Assets and Liabilities |  |  |
Net regulatory assets (liabilities) | $ (53) |  | $ (25)

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