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Regulatory Assets and Liabilities (Regulatory Balancing Accounts) (Details) - SCE - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
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Regulatory balancing accounts | Energy resource recovery account |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | $ (20) | $ (439)
Regulatory balancing accounts | New system generation balancing account |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | (6) | (171)
Refunds of excess revenue | Significant components |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | (1,715) | (2,002)
Refunds of excess revenue | Public purpose programs and energy efficiency programs |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | (992) | (683)
Refunds of excess revenue | Base revenue requirement balancing account |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | (426) | (319)
Refunds of excess revenue | Tax accounting memorandum account and pole loading |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | (142) | (248)
Refunds of excess revenue | Department of Energy litigation memorandum account |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | (122) | 0
Refunds of excess revenue | Greenhouse gas auction revenue |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | 31 | (75)
Refunds of excess revenue | FERC balancing accounts |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | (69) | 74
Refunds of excess revenue | Other |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | $ 31 | $ (141)

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- Definition The net amount of all regulatory assets less all regulatory liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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