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Segment Reporting (Narrative) (Details) (USD $)
In Billions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
|
|
| Percentage Of Revenue Attributable To Major Customers | 10.00% | 10.00% | 10.00% |
| Total revenue from three customers which individually account for more than 10 percent of our consolidated product revenue | $ 1.4 | $ 1.8 | $ 0.8 |
|
Eastern Canadian Iron Ore [Member]
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| Number of mines | 2 | ||
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U.S. Iron Ore [Member]
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| Number of mines | 5 | ||
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Metallurgical Coal Mines [Member]
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| Number of mines | 5 | ||
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Thermal Coal Mines [Member]
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| Number of mines | 1 | ||
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Amapa [Member]
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| Percent ownership interest | 30.00% | ||
|
Amapa [Member] | Latin American Iron Ore [Member]
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| Percent ownership interest | 30.00% | ||
|
Sonoma [Member] | Asia Pacific Coal [Member]
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| Percent ownership interest | 45.00% | ||
| X | ||||||||||
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- Definition
Number of mines No definition available.
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| X | ||||||||||
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- Definition
The percentage of ownership of common stock or equity participation in the investee. No definition available.
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| X | ||||||||||
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- Definition
The percentage of consolidated product revenue attributable to major customers. No definition available.
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| X | ||||||||||
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- Definition
Amount of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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