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Liabilities Subject to Compromise (Details) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015
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Schedule of liabilities subject to compromise [Line Items] |  |
Liabilities Subject to Compromise | $ 8,440,200,000 | $ 0
Long-term Debt [Member] |  |
Schedule of liabilities subject to compromise [Line Items] |  |
Liabilities Subject to Compromise | 8,080,300,000 |
Interest Payable [Member] |  |
Schedule of liabilities subject to compromise [Line Items] |  |
Liabilities Subject to Compromise | 172,600,000 |
Reserve for Environmental Costs [Member] |  |
Schedule of liabilities subject to compromise [Line Items] |  |
Liabilities Subject to Compromise | 61,900,000 |
Accounts Payable [Member] |  |
Schedule of liabilities subject to compromise [Line Items] |  |
Liabilities Subject to Compromise | 58,400,000 |
Other Pension Plan, Postretirement or Supplemental Plans, Defined Benefit [Member] |  |
Schedule of liabilities subject to compromise [Line Items] |  |
Liabilities Subject to Compromise | 34,600,000 |
Accrued Liabilities [Member] |  |
Schedule of liabilities subject to compromise [Line Items] |  |
Liabilities Subject to Compromise | 32,400,000 |
Debt [Member] | Long-term Debt [Member] |  |
Schedule of liabilities subject to compromise [Line Items] |  |
Liabilities Subject to Compromise | 7,771,200,000 |
Hedge terminations [Member] | Long-term Debt [Member] |  |
Schedule of liabilities subject to compromise [Line Items] |  |
Liabilities Subject to Compromise | 257,300,000 |
Liabilities secured by prepetition letters of credit [Member] | Long-term Debt [Member] |  |
Schedule of liabilities subject to compromise [Line Items] |  |
Liabilities Subject to Compromise | $ 51,800,000 |

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