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Basis of Presentation (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 USD ($) | Dec. 31, 2016 mi² shares retail_customers
Basis of Presentation [Abstract] |  |
Proceeds from Legal Settlements | $ | $ 6 |
Incorporated Cities |  | 51
Service Area Sq Miles | mi² |  | 4,000
Number of Retail Customers | retail_customers |  | 863,000
Service area population |  | 1,900,000
Percent of State's Population |  | 46.00%
Entity Number of Employees |  | 2,752
Number of Union Employees |  | 783
Number of Union Employees Subject to Agreement A |  | 730
Number of Union Employees Subject to Agreement B |  | 53
Proceeds from Insurance Settlement, Investing Activities | $ | 3 |
Proceeds from Sale of Productive Assets | $ | $ 5 |

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- Definition Number of incorporated cities in service area. + References No definition available. + Details
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- Definition Includes residential, commercial and industrial. + References No definition available. + Details
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- Definition Number of employees subject to collective bargaining agreement B. + References No definition available. + Details
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- Definition Service area population as a percent of the state's population. + References No definition available. + Details
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- Definition Service Area Population + References No definition available. + Details
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- Definition The cash inflow from the amounts received by the insured under the terms of an insurance contract settlement. This element pertains only to insurance proceeds related to investments, for example fixed assets. It excludes insurance settlements classified as operating cash flows. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 + Details
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- Definition The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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