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Regulatory Assets and Liabilities (Regulatory Balancing Accounts) (Details) - Southern California Edison - USD ($) $ in Millions | Sep. 30, 2015 | Dec. 31, 2014
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Regulatory balancing accounts | Energy resource recovery account |  |
Regulatory Assets and Liabilities |  |
Net liability | $ (112) | $ 1,028
Regulatory balancing accounts | New system generation balancing account |  |
Regulatory Assets and Liabilities |  |
Net liability | (71) | 35
Refunds of excess revenue | Significant Components |  |
Regulatory Assets and Liabilities |  |
Net liability | (1,283) | (331)
Refunds of excess revenue | Public purpose programs and energy efficiency programs |  |
Regulatory Assets and Liabilities |  |
Net liability | (754) | (874)
Refunds of excess revenue | Base rate recovery balancing account |  |
Regulatory Assets and Liabilities |  |
Net liability | (79) | (5)
Refunds of excess revenue | Greenhouse gas auction revenue |  |
Regulatory Assets and Liabilities |  |
Net liability | (142) | (182)
Refunds of excess revenue | FERC balancing accounts |  |
Regulatory Assets and Liabilities |  |
Net liability | 16 | (32)
Refunds of excess revenue | Generator settlements |  |
Regulatory Assets and Liabilities |  |
Net liability | (3) | (197)
Refunds of excess revenue | Other |  |
Regulatory Assets and Liabilities |  |
Net liability | $ (138) | $ (104)

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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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