Segment Reporting (Narrative) (Details) (USD $) In Millions, unless otherwise specified |
9 Months Ended |
|---|---|
Sep. 30, 2011 | |
| Segment Reporting Information, Intersegment Revenue | $ 0 |
Amapa [Member] | Latin American Iron Ore [Member] |
Ìý |
| Percent ownership interest | 30.00% |
Sonoma [Member] | Asia Pacific Coal [Member] |
Ìý |
| Percent ownership interest | 45.00% |
RenewaFUEL [Member] | Alternative Energies [Member] |
Ìý |
| Percent ownership interest | 95.00% |
U.S. Iron Ore [Member] |
Ìý |
| Number of Mines in Operation | 5 |
Eastern Canadian Iron Ore [Member] |
Ìý |
| Number of Mines in Operation | 2 |
Asia Pacific Iron Ore [Member] |
Ìý |
| Number of Mines in Operation | 2 |
North American Coal [Member] |
Ìý |
| Number of Mines in Operation | 5 |
Thermal Coal [Member] |
Ìý |
| Number of Mines in Operation | 1 |
| X | ||||||||||
- Definition Number of Mines in Operation
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| X | ||||||||||
- Definition The percentage of ownership of common stock or equity participation in the investee.
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| X | ||||||||||
- Definition Amount of revenue from transactions with other operating segments of the same entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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