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Restructuring And Other Charges (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges | $ 281 | $ 207 | $ 237
Restructuring and other charges, after-tax and noncontrolling interests | 181 | 130 | 151
Number of employees associated with layoff costs | 1,600 |  |
Other asset impairment charges |  |  | 13
Number of U.S. locations permanently shutdown and planned demolition | 2 | 5 |
Asset impairments, after-tax and noncontrolling interests |  |  | 11
Other exit costs | 5 | 2 | 19
Other exit costs, after-tax and noncontrolling interests | 4 | 2 | 10
Cash payments | 54 | 108 | 221
Total number of employees already laid off |  |  | 6,600
Layoff costs of positions eliminations | 33 |  |
Layoff costs of positions eliminations, after-tax | 31 |  |
Number of employees layoff | 650 |  |
Number of European smelters management approved partial or full curtailment for | 3 |  |
Number of smelters in Spain where curtailment is planned to be temporary | 2 |  |
Asset impairments | 150 | 139 | 54
Restructuring reserve, other adjustment | 23 | 33 |
Restructuring reserve, other adjustment, after-tax | 16 | 24 |
Inventory write-down - permanent shutdown and planned demolition of idled structures |  | 8 |
Inventory write-down, after-tax and non-controlling interests |  | 5 |
Reserves related to the wire harness and electrical portion of the EES business |  |  | 26
Minimum amount of cash payments expected to be paid beyond the end of the current annual period | 45 |  |
Maximum amount of cash payments expected to be paid beyond the end of the current annual period | 50 |  |
Engineered Products And Solutions [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges | (3) | 18 | 64
Number of employees associated with layoff costs | 20 | 625 | 2,980
Flat-Rolled Products [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges | 19 | (11) | 65
Number of employees associated with layoff costs | 470 | 25 | 2,190
Primary Metals [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges | 212 | 145 | 30
Number of employees associated with layoff costs | 820 | 75 | 1,080
Alumina [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges | 39 | 12 | 5
Number of employees associated with layoff costs | 160 | 60 | 180
Corporate [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges | 14 | 43 | 73
Number of employees associated with layoff costs | 130 | 90 | 170
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 |
Warrick, IN [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Number of potlines to be shutdown and demolished |  | 1 |
Rockdale TX [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Number of potlines to be shutdown and demolished | 2 |  |
Number of potlines at facility | 4 |  |
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 |  |
Cash payments | 9 | 15 | 18
Asset Impairments [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges | 127 |  |
Restructuring and other charges, after-tax and noncontrolling interests | 82 |  |
Asset impairments |  | 127 |
Asset impairments after-tax |  | 80 |
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 |  |
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 |
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 |
Litigation Matter [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges | 20 |  |
Restructuring and other charges, after-tax and noncontrolling interests | 8 |  |
Layoff Costs [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges | 93 |  | 177
Restructuring and other charges, after-tax and noncontrolling interests | 68 |  | 121
Cash payments | 45 | 93 | 203
Write-Off Of Capitalized Business Acquisition Costs [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges |  |  | 18
Restructuring and other charges, after-tax and noncontrolling interests |  |  | 12
Permanent Shutdown And Planned Demolition Of Idled Structures [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges |  | 2 |
Other asset impairment charges |  | 127 |
Other exit costs | 36 | 46 |
Other restructuring activities, after-tax and noncontrolling interests |  | 1 |
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 |
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] | 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] | Remaining Capacity [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Reduction in production - result of market conditions, in kmt per year | 191 |  |
Pension Plan Curtailment Workforce Reductions [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges |  |  | 9
Restructuring and other charges, after-tax and noncontrolling interests |  |  | 6
Businesses Held For Sale [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges |  |  | 41
Restructuring and other charges, after-tax and noncontrolling interests |  |  | 20
Restructuring Programs (Layoffs), 2011 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Cash payments | 24 |  |
Total number of employees already laid off | 380 |  |
Number of positions terminated | 1,600 |  |
Restructuring Programs (Layoffs), 2010 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Number of employees associated with layoff costs |  | 875 |
Cash payments | 7 | 21 |
Total number of employees already laid off | 790 |  |
Number of positions terminated | 875 |  |
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), 2009 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Number of employees associated with layoff costs | 6,000 |  |
Other restructuring activities, after-tax and noncontrolling interests |  |  | 29
Total number of employees expected to be laid off | 5,700 |  |
Cash payments | 13 | 60 |
Reserves related to the wire harness and electrical portion of the EES business |  |  | 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 |  |
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 of smelters for which management approved partial or full curtailment, in kmt | 93 |  |
Capacity for which management approved partial or full curtailment, in kmt | 46 |  |
La Coruna, Spain [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Capacity of smelters for which management approved partial or full curtailment, in kmt | 87 |  |
Capacity for which management approved partial or full curtailment, in kmt | 44 |  |

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- Definition Amount of cash paid in the period to fully or partially settle a specified, previously accrued type of restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=6394695&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) (2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 95-3 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 146 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_RestructuringReserveSettledWithCash
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration