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Regulatory Assets and Liabilities (Regulatory Balancing Accounts) (Details) - Regulatory balancing accounts - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
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Energy resource recovery account |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | $ (439) | $ 1,028
New system generation balancing account |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | (171) | 35
Public purpose programs and energy efficiency programs |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | (683) | (874)
Base rate recovery balancing account |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | (319) | (5)
Greenhouse gas auction revenue |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | (75) | (182)
FERC balancing accounts |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | 74 | (32)
Tax accounting memorandum account and pole loading |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | (248) | 0
Other |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | (137) | (104)
Liability |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | (2,002) | (331)
Southern California Edison | Generator settlements |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | $ (4) | $ (197)

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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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