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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