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Regulatory Assets and Liabilities (Schedule of Net Regulatory Balancing Accounts) (Details) - Southern California Edison - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Regulatory balancing accounts | Energy resource recovery account |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | $ 30 | $ (20)
Regulatory balancing accounts | New system generation balancing account |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (97) | (6)
Refunds of excess revenue | Significant Components |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (1,811) | (1,715)
Refunds of excess revenue | Public purpose programs and energy efficiency programs |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (1,056) | (992)
Refunds of excess revenue | Tax accounting memorandum account and pole loading balancing account |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (136) | (142)
Refunds of excess revenue | Base rate recovery balancing account |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (360) | (426)
Refunds of excess revenue | Department of Energy litigation memorandum account |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (123) | (122)
Refunds of excess revenue | Greenhouse gas auction revenue |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (3) | 31
Refunds of excess revenue | FERC balancing accounts |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (93) | (69)
Refunds of excess revenue | Other |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | $ 27 | $ 31

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