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Basis of Presentation (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2014 sqmi retail_customers | Jun. 30, 2013 | Jun. 30, 2014 sqmi retail_customers | Jun. 30, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2013
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |
Service Area Sq Miles | 4,000 |  | 4,000 |  |  |  |  |  |
Incorporated Cities | 52 |  | 52 |  |  |  |  |  |
Number of Retail Customers | 841,930 |  | 841,930 |  |  |  |  |  |
Service Area Population | 1.7 |  | 1.7 |  |  |  |  |  |
Percent of State's Population | 44.00% |  | 44.00% |  |  |  |  |  |
Margin Deposit Assets | $ 2 |  | $ 2 |  |  |  |  |  | $ 9
Cash received to be returned to customers pursuant to the Residential Exchange Program |  |  | 14 | 1 |  |  |  |  |
Power Cost Deferrals, Net |  |  |  | 3 |  |  |  |  |
Other Comprehensive Income | 0 | 0 | 0 | 0 |  |  |  |  |
Revenue overstatement |  | $ 9 |  |  | $ 3 | $ 3 | $ 2 | $ 1 |

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- Definition Costs of power used for operations in prior periods that were expected to be recovered from customers in future periods. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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