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Basis of Presentation (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 sqmi | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Basis of Presentation [Abstract] |  |  |  |  |
revenue overstatment | $ 9 | $ 3 | $ 3 | $ 2 | $ 1
Incorporated Cities | 52 |  |  |  |
Service Area Sq Miles | 4,000 |  |  |  |
Number of Retail Customers | 836,070 |  |  |  |
Service area population | 1,700,000 |  |  |  |
Percent of State's Population | 44.00% |  |  |  |
Entity Number of Employees | 2,596 |  |  |  |
Number of Union Employees | 795 |  |  |  |
Number of Union Employees Subject to Agreement A | 760 |  |  |  |
Number of Union Employees Subject to Agreement B | 35 |  |  |  |

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