Annual report pursuant to Section 13 and 15(d)

Commitments And Contingencies (Narrative) (Details)

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Commitments And Contingencies (Narrative) (Details) (USD $)
 12 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2012
Koolyanobbing [Member]
Dec. 31, 2011
Koolyanobbing [Member]
Dec. 31, 2010
Koolyanobbing [Member]
MT
Dec. 31, 2012
Koolyanobbing Rail Upgrade [Member]
Dec. 31, 2011
Koolyanobbing Rail Upgrade [Member]
Dec. 31, 2012
Bloom Lake [Member]
Dec. 31, 2011
Bloom Lake [Member]
MT
Dec. 31, 2011
Lower War Eagle [Member]
Dec. 31, 2011
Empire [Member]
T
Dec. 31, 2011
Empire And Tilden [Member]
Dec. 31, 2010
Empire And Tilden [Member]
Dec. 31, 2011
Tilden [Member]
T
Dec. 31, 2012
Oak Grove [Member]
Dec. 31, 2011
Oak Grove [Member]
Dec. 31, 2012
Pinnacle [Member]
Dec. 31, 2011
Pinnacle [Member]
Related Party Transaction [Line Items]                                      
Contractual obligations and binding commitments $ 11,000,000,000 $ 5,700,000,000                                  
Future commitments, year one 1,400,000,000                                    
Future commitments, year two 1,000,000,000                                    
Future commitments, year three 600,000,000                                    
Future commitments, year four 900,000,000                                    
Future commitments, year five 600,000,000                                    
Future commitments, thereafter 6,500,000,000                                    
Non-cash accruals 60,100,000 8,900,000 3,000,000                                
Capital investment         275,000,000         1,300,000,000 97,000,000                
Capital investment committed           259,000,000   33,000,000   445,000,000 55,000,000   178,000,000       52,000,000    
Increase in production capacity, tons                   8,000,000         2,000,000        
Gross post-project production capacity, tons           11,000,000       16,000,000   3,000,000              
Capital investment paid         202,000,000     25,000,000   165,000,000 40,000,000           46,000,000   142,000,000
Capital investment, future payments       57,000,000     8,000,000   280,000,000   15,000,000     264,000,000   6,000,000   36,000,000  
Environmental liabilities $ 15,500,000 $ 13,700,000                                  
Replacement of rail and associated parts, miles 62