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Restructuring and Other Charges - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended
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Mar. 31, 2014 t Location Employees MT | Mar. 31, 2013 | Mar. 31, 2014 Fusina Italy [Member] t | Mar. 31, 2014 Point Henry Smelter [Member] t | Mar. 31, 2014 Primary Metals [Member] Employees | Mar. 31, 2013 Primary Metals [Member] Employees | Mar. 31, 2014 Engineered Products and Solutions [Member] Employees | Mar. 31, 2014 Corporate [Member] Employees | Mar. 31, 2014 Global Rolled Products [Member] Employees | Mar. 31, 2014 Alumina [Member] Employees | Mar. 31, 2014 Layoff Costs [Member] | Mar. 31, 2013 Layoff Costs [Member] | Mar. 31, 2014 Layoff Costs [Member] Primary Metals [Member] | Mar. 31, 2014 Other Miscellaneous Items [Member] | Mar. 31, 2013 Other Miscellaneous Items [Member] | Mar. 31, 2014 Restructuring Programs Layoffs 2014 [Member] Employees | Mar. 31, 2014 Restructuring Programs Layoffs 2013 [Member] Employees | Mar. 31, 2014 Other Exit Costs [Member] | Mar. 31, 2014 Smelter Curtailments [Member] Location Employees | Mar. 31, 2014 Asset Impairment [Member] | Mar. 31, 2014 Small Layoff Reserves Related to Prior Periods [Member] | Mar. 31, 2014 Permanent Shutdown and Planned Demolition of Idled Structures [Member] | Mar. 31, 2014 Operating Supplies [Member] | Mar. 31, 2014 Asset Retirement Obligations [Member] | Dec. 31, 2013 Asset Retirement Obligations [Member] | Mar. 31, 2014 Environmental Remediation [Member] | Dec. 31, 2013 Environmental Remediation [Member] | Mar. 31, 2014 Supplier And Customer Contract [Member]
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and other charges | $ 461 | $ 7 |  |  |  |  |  |  |  |  | $ 13 | $ 3 | $ 133 | $ 15 | $ 4 |  |  | $ 336 | $ 70 | $ 33 | $ 6 |  |  | $ 55 | $ 12 | $ 42 | $ 58 |
Restructuring and other charges, after-tax and noncontrolling interests | 274 | 5 |  |  |  |  |  |  |  |  | 8 | 2 |  | 9 | 3 |  |  | 186 | 46 | 26 | 4 |  |  |  |  |  |  |
Number of employees associated with layoff costs |  |  |  |  |  | 60 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of U.S. locations permanently shutdown and planned demolition | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Number of employees associated with layoff costs | 40 |  |  |  | 1,230 |  | 110 | 60 | 470 | 90 |  |  |  |  |  |  |  |  | 170 |  |  |  |  |  |  |  |  |
Reduction in production - result of market conditions, in metric tons per year | 460,000 |  | 84,000 | 1,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining smelting capacity subject to review | 62,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional smelting capacity subject to review | 85,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of mills permanently shutdown and planned demolition | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in combined capacity | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of employees associated with layoff costs | 1,830 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other asset impairment charges | 91 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated depreciation | 59 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other exit costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 123 |  | 55 |  | 38 |  | 30
Inventory write-down - permanent shutdown and planned demolition of idled structures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 34 |  |  |  |  |
Inventory write-down, after-tax and non-controlling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 |  |  |  |  |
Additional charges related to shutdown actions | 220 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total number of employees already laid off |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 | 1,260 |  |  |  |  |  |  |  |  |  |  |
Number of positions separated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000 | 1,660 |  |  |  |  |  |  |  |  |  |  |
Cash payments made against the layoff reserves |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 24 |  |  |  |  |  |  |  |  |  |  |
Minimum amount of cash payments expected to be paid beyond the end of the current annual period | 35 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount of cash payments expected to be paid beyond the end of the current annual period | $ 70 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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