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Regulatory Assets and Liabilities (Schedule of Net Regulatory Balancing Accounts) (Details) - Southern California Edison - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016
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Regulatory balancing accounts | Energy resource recovery account |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | $ 228 | $ (20)
Regulatory balancing accounts | New system generation balancing account |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (175) | (6)
Refunds of excess revenue | Net regulatory balancing accounts |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (1,702) | (1,715)
Refunds of excess revenue | Public purpose programs and energy efficiency programs |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (1,064) | (992)
Refunds of excess revenue | Tax accounting memorandum account and pole loading balancing account |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (197) | (142)
Refunds of excess revenue | Base rate recovery balancing account |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (257) | (426)
Refunds of excess revenue | Department of Energy litigation memorandum account |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (156) | (122)
Refunds of excess revenue | Greenhouse gas auction revenue |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | 24 | 31
Refunds of excess revenue | FERC balancing accounts |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (136) | (69)
Refunds of excess revenue | Other |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | $ 31 | $ 31

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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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