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Restructuring and Other Charges - Additional Information (Detail) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2016 Employees | Sep. 30, 2016 USD ($) Employees | Sep. 30, 2015 USD ($) Employees T | Jun. 30, 2015 t | Sep. 30, 2016 USD ($) Employees | Sep. 30, 2015 USD ($) Employees t | Dec. 31, 2015 Employees
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and other charges |  | $ 18,000,000 | $ 66,000,000 |  | $ 134,000,000 | $ 460,000,000 |
Restructuring and other charges after tax and noncontrolling interest |  | 10,000,000 | 30,000,000 |  | 87,000,000 | 329,000,000 |
Inventory write down |  |  |  |  |  | 4,000,000 |
Inventory write down after tax and noncontrolling interests |  |  |  |  |  | 2,000,000 |
Minimum amount of cash payments expected to be paid beyond the end of the current annual period |  |  |  |  | 30,000,000 |  |
Maximum amount of cash payments expected to be paid beyond the end of the current annual period |  |  |  |  | 35,000,000 |  |
Restructuring Charges [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and other charges |  |  | 42,000,000 |  |  |  |
Restructuring and other charges after tax and noncontrolling interest |  |  | 20,000,000 |  |  |  |
Corporate [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and other charges |  | 6,000,000 | $ 9,000,000 |  | $ 3,000,000 | 38,000,000 |
Three Other Segments and Corporate [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Number of employees associated with layoff costs | Employees |  |  | 15 |  |  |  |
Capacity closure | T |  |  | 887,000,000,000 |  |  |  |
Pocos de Caldas Smelter [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Capacity closure | t |  |  |  | 96,000 |  |  |
Point Henry Smelter [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Percentage of power supply |  |  |  |  | 40.00% |  |
Sao Luis Smelter [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and other charges |  |  |  |  |  | 80,000,000 |
Restructuring and other charges after tax and noncontrolling interest |  |  |  |  |  | $ 43,000,000 |
Number of employees associated with layoff costs | Employees |  |  |  |  |  | 800 |
Curtailment capacity | t |  |  |  |  |  | 74,000 |
Sao Luis Smelter [Member] | Primary Metals [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Number of employees associated with layoff costs | Employees |  |  |  |  |  | 680 |
Sao Luis Smelter [Member] | Alumina [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Number of employees associated with layoff costs | Employees |  |  |  |  |  | 120 |
Suriname [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Curtailment capacity | t |  |  |  |  |  | 1,330,000 |
Warrick Smelter, Wenatchee Smelter and Point Comfort [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and other charges |  | 2,000,000 |  |  | $ 84,000,000 |  |
Restructuring and other charges after tax and noncontrolling interest |  | 1,000,000 |  |  | 56,000,000 |  |
Warrick, IN Smelter [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Other costs |  | 2,000,000 |  |  | 38,000,000 |  |
Inventory write down |  |  |  |  | 5,000,000 |  |
Inventory write down after tax and noncontrolling interests |  |  |  |  | 3,000,000 |  |
Other related costs |  | 2,000,000 |  |  | 4,000,000 |  |
Asset Retirement Obligation Costs [Member] | Warrick, IN Smelter [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Other costs |  | 3,000,000 |  |  | 4,000,000 |  |
Exit Cost [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and other charges |  |  |  |  |  | $ 190,000,000 |
Restructuring and other charges after tax and noncontrolling interest |  |  |  |  |  | 120,000,000 |
Divested Businesses [Member] | Rolling Mill in Russia [Member] | Global Rolled Products [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and other charges |  |  |  |  |  | 161,000,000 |
Restructuring and other charges after tax and noncontrolling interest |  |  |  |  |  | 151,000,000 |
Restructuring Programs Layoffs 2014 [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and other charges |  |  | $ 33,000,000 |  |  | 62,000,000 |
Restructuring and other charges after tax and noncontrolling interest |  |  | $ 29,000,000 |  |  | $ 50,000,000 |
Number of employees associated with layoff costs | Employees |  |  | 370 |  |  | 970 |
Cash payments made against the layoff reserves |  | 1,000,000 |  |  | 4,000,000 |  |
Restructuring Programs Layoffs 2014 [Member] | Corporate [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Number of employees associated with layoff costs | Employees |  |  |  |  |  | 50 |
Restructuring Programs Layoffs 2014 [Member] | Global Rolled Products [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Number of employees associated with layoff costs | Employees |  |  |  |  |  | 70 |
Restructuring Programs Layoffs 2014 [Member] | Primary Metals [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Number of employees associated with layoff costs | Employees |  |  |  |  |  | 165 |
Restructuring Programs Layoffs 2014 [Member] | Transportation and Construction Solutions [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Number of employees associated with layoff costs | Employees |  |  | 355 |  |  | 410 |
Restructuring Programs Layoffs 2014 [Member] | Engineered Products and Solutions [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Number of employees associated with layoff costs | Employees |  |  |  |  |  | 275 |
Other Miscellaneous Items [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and other charges |  | 8,000,000 | $ 2,000,000 |  | 16,000,000 | $ 3,000,000 |
Restructuring and other charges after tax and noncontrolling interest |  | 5,000,000 | 9,000,000 |  | 9,000,000 | 13,000,000 |
Other Adjustments [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and other charges |  | 8,000,000 | 4,000,000 |  | 20,000,000 | 12,000,000 |
Restructuring and other charges after tax and noncontrolling interest |  | 4,000,000 | 2,000,000 |  | 13,000,000 | 9,000,000 |
Shutdown and Curtailment Actions [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  | $ 86,000,000 |
Number of employees associated with layoff costs | Employees |  |  |  |  |  | 90 |
Shutdown and Curtailment Actions [Member] | Australia [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Gain on sale of land |  |  | 18,000,000 |  |  |  |
Gain on sale of land after tax |  |  | 13,000,000 |  |  |  |
Layoff Costs [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and other charges |  |  | 11,000,000 |  |  | $ 22,000,000 |
Other Exit Costs [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and other charges |  |  |  |  |  | 82,000,000 |
Other Exit Costs [Member] | Three Other Segments and Corporate [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and other charges |  |  | 11,000,000 |  |  |  |
Restructuring and other charges after tax and noncontrolling interest |  |  | $ 5,000,000 |  |  |  |
Asset Retirement Obligations [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and other charges |  |  |  |  |  | 45,000,000 |
Environmental Remediation [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and other charges |  |  |  |  |  | 29,000,000 |
Supplier and Customer Contract [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and other charges |  |  |  |  |  | 8,000,000 |
Pension Costs [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and other charges |  |  |  |  |  | $ 11,000,000 |
Restructuring And Related Charges [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and other charges |  | 20,000,000 |  |  |  |  |
Restructuring and other charges after tax and noncontrolling interest |  | $ 10,000,000 |  |  |  |  |
Restructuring Programs Layoffs 2015 [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and other charges |  |  |  |  | 54,000,000 |  |
Restructuring and other charges after tax and noncontrolling interest |  |  |  |  | $ 35,000,000 |  |
Number of employees associated with layoff costs | Employees | 4,700 | 100 |  |  | 1,200 |  | 5,000
Approximate number of employees already laid off | Employees | 4,100 | 4,100 |  |  | 4,100 |  |
Cash payments made against the layoff reserves |  | $ 17,000,000 |  |  | $ 109,000,000 |  |
Restructuring Programs Layoffs 2015 [Member] | Corporate [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Number of employees associated with layoff costs | Employees |  | 10 |  |  | 10 |  |
Restructuring Programs Layoffs 2015 [Member] | Global Rolled Products [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Number of employees associated with layoff costs | Employees |  |  |  |  | 30 |  |
Restructuring Programs Layoffs 2015 [Member] | Primary Metals [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Number of employees associated with layoff costs | Employees |  | 30 |  |  | 60 |  |
Restructuring Programs Layoffs 2015 [Member] | Transportation and Construction Solutions [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Number of employees associated with layoff costs | Employees |  |  |  |  | 240 |  |
Restructuring Programs Layoffs 2015 [Member] | Engineered Products and Solutions [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Number of employees associated with layoff costs | Employees |  | 60 |  |  | 860 |  |
Asset Impairment and Accelerated Depreciation [Member] | Warrick, IN Smelter [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and other charges |  |  |  |  | $ 70,000,000 |  |
Severance costs |  | $ 4,000,000 |  |  | 24,000,000 |  |
Other costs |  | 2,000,000 |  |  | 38,000,000 |  |
Contract Termination [Member] | Warrick, IN Smelter [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Other costs |  | $ 3,000,000 |  |  | $ 30,000,000 |  |
Restructuring Programs Layoffs 2016 [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Number of employees associated with layoff costs | Employees | 1,200 |  |  |  |  |  |
Approximate number of employees already laid off | Employees | 900 | 900 |  |  | 900 |  |
Cash payments made against the layoff reserves |  | $ 8,000,000 |  |  | $ 19,000,000 |  |

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