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Reconciliation of Segment Information, Total Assets (Details) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Assets: |  |  |
Total Assets | $ 9,183,981,000 | $ 10,929,902,000 | $ 11,654,646,000
Items excluded from segment assets: |  |  |
Income Taxes Receivable, Current | 116,851,000 | 13,887,000 |
Total Property, Plant and Equipment-Net | 8,140,439,000 | 9,669,377,000 |
Deferred Tax Assets | 853,542,000 | 1,027,604,000 |
Unamortized Debt Issuance Expense | 27,699,000 | 33,017,000 |
Total Reportable Business Segments |  |  |
Assets: |  |  |
Total Assets | 8,217,774,000 | 8,968,585,000 |
Gas Segment [Member] |  |  |
Assets: |  |  |
Total Assets | 6,235,568,000 | 6,892,284,000 | 7,364,185,000
Items excluded from segment assets: |  |  |
Total Property, Plant and Equipment-Net | 5,744,930,000 | 6,179,353,000 |
Corporate and Other [Member] |  |  |
Assets: |  |  |
Total Assets | 797,830,000 | 859,675,000 |
Other Segments [Member] |  |  |
Assets: |  |  |
Total Assets | 966,124,000 | 939,497,000 | 1,186,874,000
Items excluded from segment assets: |  |  |
Total Property, Plant and Equipment-Net | 657,461,000 | 696,088,000 |
Excludes Gas Segment [Member] |  |  |
Items excluded from segment assets: |  |  |
Cash and Other Investments | 47,153,000 | 65,935,000 |
Intersegment Eliminations [Member] |  |  |
Assets: |  |  |
Total Assets | 83,000 | 1,021,820,000 | $ 1,009,546,000
Items excluded from segment assets: |  |  |
Income Taxes Receivable, Current | 116,851,000 | 13,887,000 |
Deferred Tax Assets | 4,290,000 | 0 |
Disposal Group, Including Discontinued Operation, Assets | 83,000 | 1,021,820,000 |
UNITED STATES |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Disclosure of Long-Live Assets by Geographic Region | 8,129,415,000 | 8,721,682,000 |
CANADA |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Disclosure of Long-Live Assets by Geographic Region | 11,024,000 | 11,024,000 |
Discontinued Operations [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Disclosure of Long-Live Assets by Geographic Region | $ 0 | $ 936,671,000 |

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