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Liabilities Subject to Compromise (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
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