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Restructuring and Other Charges - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 Person | Dec. 31, 2011 Person GeneratingPlant Location | Dec. 31, 2010 Location
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges | $ 87 | $ 281 | $ 207
Restructuring and other charges, after-tax and noncontrolling interests | 73 | 181 | 130
Number of employees associated with layoff costs | 800 | 1,600 |
Restructuring reserve, other adjustment |  | 23 | 33
Restructuring reserve, other adjustment, after-tax |  | 16 | 24
Number of U.S. locations permanently shutdown and planned demolition |  | 2 | 5
Other exit costs |  | 5 | 2
Other exit costs, after-tax and noncontrolling interests |  | 4 | 2
Inventory write-down - permanent shutdown and planned demolition of idled structures |  |  | 8
Inventory write-down, after-tax and non-controlling interests |  |  | 5
Number of European smelters, management approved, partial or full curtailment |  | 3 |
Number of smelters in Spain where curtailment is planned to be temporary |  | 2 |
Layoff costs of positions eliminations |  | 33 |
Layoff costs of positions eliminations, after-tax |  | 31 |
Number of employees layoff |  | 650 |
Asset impairments | 40 | 150 | 139
Minimum amount of cash payments expected to be paid beyond the end of the current annual period | 50 |  |
Maximum amount of cash payments expected to be paid beyond the end of the current annual period | 55 |  |
Primary Metals [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges | 20 | 212 | 145
Number of employees associated with layoff costs | 250 | 820 | 75
Global Rolled Products [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges | 43 | 19 | (11)
Number of employees associated with layoff costs |  | 470 | 25
Alumina [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges | 3 | 39 | 12
Number of employees associated with layoff costs | 85 | 160 | 60
Engineered Products and Solutions [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges | 13 | (3) | 18
Number of employees associated with layoff costs | 390 | 20 | 625
Corporate [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges | 8 | 14 | 43
Number of employees associated with layoff costs | 75 | 130 | 90
Divested Businesses [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges |  |  | 22
Restructuring and other charges, after-tax and noncontrolling interests |  |  | 14
Asset impairments |  |  | 12
Asset impairments, after-tax |  |  | 8
Other Miscellaneous Items [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring reserve, other adjustment | 4 |  |
Restructuring reserve, other adjustment, after-tax | 4 |  |
Rockdale, TX [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Number of U.S. locations permanently shutdown and planned demolition |  | 2 |
Number of potlines to be shutdown and demolished |  | 2 |
Number of potlines at facility |  | 4 |
Warrick, IN [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Number of potlines to be shutdown and demolished |  |  | 1
Asset Impairments [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges |  | 127 |
Restructuring and other charges, after-tax and noncontrolling interests |  | 82 |
Restructuring reserve, other adjustment | 30 |  |
Restructuring reserve, other adjustment, after-tax | 30 |  |
Asset impairments |  |  | 127
Asset impairments, after-tax |  |  | 80
Other Exit Costs [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges |  | 36 | 46
Restructuring and other charges, after-tax and noncontrolling interests |  | 23 | 29
Other exit costs |  | 1 |
Other exit costs, after-tax and noncontrolling interests |  | 1 |
Layoff Costs [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges | 47 | 93 |
Restructuring and other charges, after-tax and noncontrolling interests | 29 | 68 |
Other Asset Impairments [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges |  | 23 |
Restructuring and other charges, after-tax and noncontrolling interests |  | 12 |
Restructuring reserve, other adjustment | 10 |  |
Restructuring reserve, other adjustment, after-tax | 8 |  |
Litigation Matter [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges |  | 20 |
Restructuring and other charges, after-tax and noncontrolling interests |  | 8 |
Permanent Shutdown and Planned Demolition of Idled Structures [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges |  |  | 2
Other exit costs |  | 36 | 46
Other asset impairment charges |  | 127 | 127
Other restructuring activities, after-tax and noncontrolling interests |  |  | 1
Permanent Shutdown and Planned Demolition of Idled Structures [Member] | Alcoa, TN [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Reduction in production - result of market conditions, in kmt per year |  | 215 |
Permanent Shutdown and Planned Demolition of Idled Structures [Member] | Rockdale, TX [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Reduction in production - result of market conditions, in kmt per year |  | 76 |
Permanent Shutdown and Planned Demolition of Idled Structures [Member] | Remaining Capacity [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Reduction in production - result of market conditions, in kmt per year |  | 191 |
Permanent Shutdown and Planned Demolition of Idled Structures [Member] | Frederick, MD [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Reduction in production - result of market conditions, in kmt per year |  |  | 195
Permanent Shutdown and Planned Demolition of Idled Structures [Member] | Badin, NC [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Reduction in production - result of market conditions, in kmt per year |  |  | 60
Permanent Shutdown and Planned Demolition of Idled Structures [Member] | Warrick, IN [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Reduction of production plan included in asset impairment, kmt |  |  | 40
Operating Supplies [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Inventory write-down - permanent shutdown and planned demolition of idled structures |  | 6 |
Inventory write-down, after-tax and non-controlling interests |  | 4 |
Environmental Remediation [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges |  | 18 |
Restructuring and other charges, after-tax and noncontrolling interests |  |  | 14
Other exit costs |  | 18 | 14
Other exit costs, after-tax and noncontrolling interests |  | 11 | 9
Asset Retirement Obligations [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges |  | 17 |
Restructuring and other charges, after-tax and noncontrolling interests |  |  | 30
Other exit costs |  | 17 | 30
Other exit costs, after-tax and noncontrolling interests |  | 11 | 19
Restructuring Programs Layoffs 2010 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Number of employees associated with layoff costs |  |  | 875
Cash payments made against the layoff reserves | 3 | 7 |
Restructuring Programs Layoffs 2010 [Member] | Engineered Products and Solutions [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges |  |  | 43
Restructuring and other charges, after-tax and noncontrolling interests |  |  | 29
Restructuring Programs Layoffs 2012 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total number of employees already laid off | 270 |  |
Number of positions separated | 800 |  |
Cash payments made against the layoff reserves | 16 |  |
Smelter Curtailments [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges | 10 |  |
Restructuring and other charges, after-tax and noncontrolling interests | 7 |  |
Number of employees associated with layoff costs | 170 |  |
Lease and Contract Termination Costs [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring reserve, other adjustment | 6 |  |
Restructuring reserve, other adjustment, after-tax | 6 |  |
Small Layoff Reserves Related to Prior Periods [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring reserve, other adjustment | 21 |  |
Restructuring reserve, other adjustment, after-tax | 15 |  |
Portovesme Smelter [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring reserve, other adjustment | 11 |  |
Restructuring reserve, other adjustment, after-tax | 11 |  |
Portovesme, Italy [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Capacity for which management approved partial or full curtailment, in kmt |  | 150 |
Aviles, Spain [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Capacity for which management approved partial or full curtailment, in kmt |  | 46 |
Capacity of smelters for which management approved partial or full curtailment, in kmt |  | 93 |
La Coruna, Spain [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Capacity for which management approved partial or full curtailment, in kmt |  | 44 |
Capacity of smelters for which management approved partial or full curtailment, in kmt |  | 87 |
Restructuring Programs (Layoffs), 2011 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total number of employees already laid off | 895 |  |
Number of positions separated | 1,475 |  |
Cash payments made against the layoff reserves | 23 | 24 |
Spain [Member] | Smelter Operation [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring reserve, other adjustment | 10 |  |
Restructuring reserve, other adjustment, after-tax | $ 7 |  |
Total number of employees already laid off | 55 |  |

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- Definition Amount charged against earnings in the period after-tax and noncontrolling interests for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a program that is planned and controlled by management, and materially changes either the scope of a business undertaken by an entity, or the manner in which that business is conducted. + References No definition available. + Details
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