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Regulatory Assets and Liabilities (Regulatory Balancing Accounts) (Details) (Southern California Edison, USD $) In Millions, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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Regulatory balancing accounts | Energy resource recovery account |  |
Regulatory Assets and Liabilities |  |
Net liability | $ 1,570 | $ 1,005
Regulatory balancing accounts | Four Corners memorandum account |  |
Regulatory Assets and Liabilities |  |
Net liability | 6 | 145
Regulatory balancing accounts | New system generation balancing account |  |
Regulatory Assets and Liabilities |  |
Net liability | 117 | 132
Refunds of excess revenue | Significant Components |  |
Regulatory Assets and Liabilities |  |
Net liability | (189) | (554)
Refunds of excess revenue | Public purpose programs and energy efficiency programs |  |
Regulatory Assets and Liabilities |  |
Net liability | (832) | (1,037)
Refunds of excess revenue | Base rate recovery balancing account |  |
Regulatory Assets and Liabilities |  |
Net liability | (243) | (247)
Refunds of excess revenue | Greenhouse gas auction revenue |  |
Regulatory Assets and Liabilities |  |
Net liability | (300) | (385)
Refunds of excess revenue | FERC formula rates and FERC balancing accounts |  |
Regulatory Assets and Liabilities |  |
Net liability | (89) | (59)
Refunds of excess revenue | FERC energy settlements |  |
Regulatory Assets and Liabilities |  |
Net liability | (195) | 0
Refunds of excess revenue | Other |  |
Regulatory Assets and Liabilities |  |
Net liability | $ (223) | $ (108)

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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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