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Restructuring And Other Charges (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended
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Sep. 30, 2011 | Sep. 30, 2010 | Jun. 30, 2011 | Sep. 30, 2011 | Sep. 30, 2010 | Dec. 31, 2010 | Dec. 31, 2009 | Sep. 30, 2010 Foreign Currency Movements [Member] | Sep. 30, 2011 Foreign Currency Movements [Member] | Sep. 30, 2010 Foreign Currency Movements [Member] | Sep. 30, 2010 Other Exit Costs [Member] | Jun. 30, 2010 Other Exit Costs [Member] | Sep. 30, 2011 Other Exit Costs [Member] | Sep. 30, 2010 Other Exit Costs [Member] | Dec. 31, 2010 Other Exit Costs [Member] | Sep. 30, 2011 Restructuring Programs, 2011 [Member] | Sep. 30, 2011 Litigation Matter [Member] | Sep. 30, 2011 Litigation Matter [Member] | Dec. 31, 2009 Restructuring Programs, 2009 [Member] | Sep. 30, 2011 Restructuring Programs, 2010 [Member] | Sep. 30, 2010 Asset Impairments [Member] | Sep. 30, 2011 Other Restructuring Charges [Member] | Sep. 30, 2011 Other Restructuring Charges [Member] | Sep. 30, 2011 Reversal of Prior Periods' Layoff Reserves [Member] | Sep. 30, 2010 Reversal of Prior Periods' Layoff Reserves [Member] | Jun. 30, 2010 Reversal of Prior Periods' Layoff Reserves [Member] | Sep. 30, 2011 Reversal of Prior Periods' Layoff Reserves [Member] | Sep. 30, 2010 Reversal of Prior Periods' Layoff Reserves [Member] | Mar. 31, 2010 Asset Retirement Obligations [Member] | Dec. 31, 2010 Asset Retirement Obligations [Member] | Mar. 31, 2010 Environmental Remediation [Member] | Dec. 31, 2010 Environmental Remediation [Member] | Sep. 30, 2010 Layoff Costs [Member] | Sep. 30, 2011 Layoff Costs [Member] | Sep. 30, 2010 Layoff Costs [Member] | Dec. 31, 2010 Layoff Costs [Member] | Mar. 31, 2010 Permanent Shutdown and Planned Demolition of Idled Structures [Member] | Sep. 30, 2010 Permanent Shutdown and Planned Demolition of Idled Structures [Member] | Mar. 31, 2010 Permanent Shutdown and Planned Demolition of Idled Structures [Member] Frederick, MD [Member] MT | Mar. 31, 2010 Permanent Shutdown and Planned Demolition of Idled Structures [Member] Badin, NC [Member] MT | Mar. 31, 2010 Permanent Shutdown and Planned Demolition of Idled Structures [Member] Comfort, TX [Member] MT | Sep. 30, 2011 Restructuring Programs (Layoffs), 2011 [Member] | Sep. 30, 2011 Restructuring Programs (Layoffs), 2011 [Member] | Sep. 30, 2011 Restructuring Programs (Layoffs), 2010 [Member] | Sep. 30, 2011 Restructuring Programs (Layoffs), 2010 [Member] | Sep. 30, 2011 Restructuring Programs (Layoffs), 2009 [Member] | Sep. 30, 2011 Restructuring Programs (Layoffs), 2009 [Member] | Sep. 30, 2010 Engineered Products and Solutions [Member] | Sep. 30, 2011 Flat-Rolled Products [Member] | Sep. 30, 2011 Flat-Rolled Products [Member] | Sep. 30, 2010 Flat-Rolled Products [Member] | Sep. 30, 2010 Corporate [Member] | Sep. 30, 2010 Corporate [Member] | Sep. 30, 2011 Primary Metals [Member] | Sep. 30, 2010 Primary Metals [Member] | Sep. 30, 2011 Primary Metals [Member] | Sep. 30, 2010 Primary Metals [Member] | Sep. 30, 2011 Alumina [Member] | Sep. 30, 2010 Alumina [Member]
Restructuring and other charges | $ 9 | $ 2 |  | $ 49 | $ 219 |  |  | $ 8 |  | $ 22 | $ 1 |  |  | $ 9 |  |  | $ 18 | $ 31 |  |  | $ 128 | $ 1 | $ 4 | $ 10 |  | $ 10 |  | $ 25 |  |  |  |  | $ 3 | $ 8 | $ 39 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and other charges, after tax and noncontrolling interests | 5 | 1 |  | 26 | 138 |  |  | 5 | 5 | 14 |  | 1 |  | 7 |  |  |  | 8 |  |  | 81 | 1 | 3 | 6 | 9 |  | 9 | 19 |  | 30 |  | 14 | 2 | 19 | 26 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of employees associated with layoff costs | 150 | 30 |  | 630 | 830 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 625 | 70 | 420 | 25 | 10 | 90 | 40 | 20 | 110 | 80 | 30 | 10
Other asset impairment charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 128 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other exit costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 |  | 14 |  |  |  |  |  | 46 | 46 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other exit costs, after tax and noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19 |  | 9 |  |  |  |  |  |  | 29 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other restructuring activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other restructuring activities, after tax and noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payments |  |  |  | 38 |  | 108 |  |  |  |  |  |  | 6 |  | 15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32 |  | 93 |  |  |  |  |  | 11 | 14 | 2 | 6 | 2 | 11 |  |  |  |  |  |  |  |  |  |  |  |
Reduction in production - result of market conditions, in kmt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 195.000 | 60.000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expansion of production plan included in asset impairment, kmt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40.000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated decrease in number of employees due to restructuring |  |  |  |  |  |  | 6,000 |  |  |  |  |  |  |  |  | 170 |  |  | 5,600 | 760 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 630 |  | 880 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventory write-down - permanent shutdown and planned demolition of idled structures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventory write-down, after tax and non-controlling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum amount of cash payments expected to be paid beyond the end of the current annual period |  |  | 60 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount of cash payments expected to be paid beyond the end of the current annual period |  |  | $ 65 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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