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Regulatory Assets and Liabilities - Regulatory Balancing Accounts (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Regulatory balancing accounts | Energy Resource Recovery Account |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | $ 1,005 | $ (135)
Regulatory balancing accounts | Four Corners Balancing Account |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | 145 | 25
Regulatory balancing accounts | New System Generation Balancing Account |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | 132 | (21)
Regulatory Balancing Accounts, Liabilities | Public Purpose Programs and Energy Efficiency Programs |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | (1,037) | (994)
Regulatory Balancing Accounts, Liabilities | Base Rate Recovery Balancing Account |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | (247) | 505
Regulatory Balancing Accounts, Liabilities | Greenhouse Gas Auction Revenue |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | (385) | (109)
Regulatory Balancing Accounts, Liabilities | FERC Balancing Account |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | (59) | (129)
Regulatory Balancing Accounts, Liabilities | Other Balancing Account |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | (108) | (142)
Regulatory Balancing Accounts, Liabilities | Significant Components |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | $ (554) | $ (1,000)

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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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