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Restructuring and Other Charges - Additional Information (Detail) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended
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Jun. 30, 2013 USD ($) t Person Location | Jun. 30, 2012 USD ($) Person | Jun. 30, 2013 USD ($) Person | Jun. 30, 2012 USD ($) Person | Mar. 31, 2013 USD ($) | Mar. 31, 2013 EUR (€) | Jun. 30, 2013 Baie Comeau [Member] USD ($) t Potline | Jun. 30, 2013 Quebec Canada [Member] t | Jun. 30, 2013 Fusina Italy [Member] t | Jun. 30, 2012 Alumina [Member] Person | Jun. 30, 2012 Alumina [Member] Person | Jun. 30, 2013 Primary Metals [Member] Person | Jun. 30, 2012 Primary Metals [Member] Person | Jun. 30, 2013 Primary Metals [Member] Person | Jun. 30, 2012 Primary Metals [Member] Person | Jun. 30, 2013 Corporate [Member] Person | Jun. 30, 2012 Corporate [Member] Person | Jun. 30, 2013 Corporate [Member] Person | Jun. 30, 2012 Corporate [Member] Person | Jun. 30, 2013 Other Miscellaneous Items [Member] USD ($) | Jun. 30, 2012 Other Miscellaneous Items [Member] USD ($) | Jun. 30, 2013 Other Miscellaneous Items [Member] USD ($) | Jun. 30, 2012 Other Miscellaneous Items [Member] USD ($) | Jun. 30, 2013 Global Rolled Products Segment Member [Member] Person | Jun. 30, 2013 Global Rolled Products Segment Member [Member] Person | Jun. 30, 2013 Engineered Products and Solutions [Member] Person | Jun. 30, 2013 Engineered Products and Solutions [Member] Person | Jun. 30, 2012 Engineered Products and Solutions [Member] Person | Jun. 30, 2012 Lease Termination Costs [Member] USD ($) | Jun. 30, 2012 Lease Termination Costs [Member] USD ($) | Jun. 30, 2013 Layoff Costs [Member] USD ($) | Jun. 30, 2012 Layoff Costs [Member] USD ($) | Jun. 30, 2013 Layoff Costs [Member] USD ($) | Jun. 30, 2012 Layoff Costs [Member] USD ($) | Jun. 30, 2013 Small Layoff Reserves Related to Prior Periods [Member] USD ($) | Jun. 30, 2012 Small Layoff Reserves Related to Prior Periods [Member] USD ($) | Jun. 30, 2013 Small Layoff Reserves Related to Prior Periods [Member] USD ($) | Jun. 30, 2012 Small Layoff Reserves Related to Prior Periods [Member] USD ($) | Jun. 30, 2013 Legal Matter [Member] USD ($) | Jun. 30, 2013 Legal Matter [Member] USD ($) | Jun. 30, 2013 Asset Impairments [Member] USD ($) | Jun. 30, 2013 Accelerated Depreciation [Member] USD ($) | Jun. 30, 2013 Other exit costs [Member] USD ($) | Jun. 30, 2013 Other exit costs [Member] USD ($) Location | Jun. 30, 2013 Asset Impairments and Retirements Costs [Member] USD ($) | Jun. 30, 2013 Asset Impairments and Retirements Costs [Member] USD ($) | Jun. 30, 2013 Operating Supplies [Member] USD ($) | Jun. 30, 2013 Permanent Shutdown and Planned Demolition of Idled Structures [Member] USD ($) | Jun. 30, 2013 Environmental Remediation [Member] USD ($) | Jun. 30, 2013 Environmental Remediation [Member] USD ($) | Jun. 30, 2013 Asset Retirement Obligations [Member] USD ($) | Jun. 30, 2013 Asset Retirement Obligations [Member] USD ($) | Jun. 30, 2012 Smelter Curtailments [Member] USD ($) Person | Jun. 30, 2013 Restructuring Programs Layoffs 2013 [Member] USD ($) Person | Jun. 30, 2013 Restructuring Programs Layoffs 2013 [Member] USD ($) Person | Jun. 30, 2013 Restructuring Programs Layoffs 2012 [Member] USD ($) Person | Jun. 30, 2013 Restructuring Programs Layoffs 2012 [Member] USD ($) Person | Jun. 30, 2013 Restructuring Programs Layoffs 2011 [Member] USD ($) | Jun. 30, 2013 Restructuring Programs Layoffs 2011 [Member] USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and other charges | $ 244 | $ 15 | $ 251 | $ 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9 |  | $ 24 | $ 6 | $ 27 | $ 17 |  |  |  |  | $ 103 | $ 103 | $ 14 | $ 23 | $ 49 | $ 86 | $ 29 | $ 29 |  |  |  | $ 12 |  | $ 54 | $ 6 |  |  |  |  |  |
Restructuring and other charges, after-tax and noncontrolling interests | 170 | 10 | 175 | 17 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  | 18 | 4 | 20 | 12 |  |  |  |  | 62 |  | 14 | 16 | 40 | 70 | 19 | 19 |  |  |  |  |  |  | 4 |  |  |  |  |  |
Number of U.S. locations permanently shutdown and planned demolition | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of employees associated with layoff costs | 470 | 110 | 530 | 330 |  |  |  |  |  | 25 | 25 | 55 | 10 | 115 | 160 | 45 | 75 | 45 | 75 |  |  |  |  | 190 | 190 | 180 | 180 | 70 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150 |  |  |  |  |  |
Restructuring reserve, other adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 | 1 | 8 | 2 |  |  |  |  |  |  | 9 |  |  |  |  | 2 | 1 | 2 | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve, other adjustment, after-tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 1 | 5 | 2 |  |  |  |  |  |  | 5 |  |  |  |  | 1 | 1 | 1 | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and other charges, after-tax and noncontrolling interests |  |  |  |  | 110 | 85 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 62 | 62 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of potlines to be shutdown and demolished |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in production - result of market conditions, in mt per year |  |  |  |  |  |  | 105,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in production - result of market conditions, in mt per year |  |  |  |  |  |  |  | 280,000 | 44,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in production - result of market conditions, in mt per year | 460,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other asset impairment charges | 23 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other asset impairment charges | 14 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventory write-down - permanent shutdown and planned demolition of idled structures | 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventory write-down, after-tax and non-controlling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |
Other exit costs |  |  |  |  |  |  | 140 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49 | 44 |  | 5 |  |  |  |  |  |  |  |
Other exit costs, after-tax and noncontrolling interests |  |  |  |  |  |  | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 36 |  | 4 |  |  |  |  |  |  |  |
Total number of employees already laid off |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 120 | 120 | 560 | 560 |  |
Number of positions separated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 530 |  | 800 |  |
Cash payments made against the layoff reserves |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 2 | 4 | 11 | 2 | 6
Minimum amount of cash payments expected to be paid beyond the end of the current annual period |  |  | 55 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount of cash payments expected to be paid beyond the end of the current annual period |  |  | $ 60 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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