Quarterly report pursuant to Section 13 or 15(d)

Segment Reporting (Narrative) (Details)

 v2.3.0.11
Segment Reporting (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2011
Segment Reporting Information, Intersegment Revenue $ 0
Amapa [Member] | Latin American Iron Ore [Member]
 
Percent ownership interest 30.00%
Sonoma [Member] | Asia Pacific Coal [Member]
 
Percent ownership interest 45.00%
renewaFUEL [Member] | Alternative Energies [Member]
 
Percent ownership interest 95.00%
U.S. Iron Ore [Member]
 
Number of Mines in Operation 5
Eastern Canadian Iron Ore [Member]
 
Number of Mines in Operation 2
Asia Pacific Iron Ore [Member]
 
Number of Mines in Operation 2
North American Coal [Member]
 
Number of Mines in Operation 5
Thermal Coal [Member]
 
Number of Mines in Operation 1