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Restructuring and Other Charges - 2017 Actions (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) employee position | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges | $ 165 | $ 155 | $ 214
Restructuring and other charges after tax | $ 143 | 114 | 192
Number of employees associated with layoff costs | position | 880 |  |
Reversal of forfeited executive stock compensation | $ 13 |  |
Severance costs | 64 | 70 | 97
Other exit costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges | 69 | 57 |
Restructuring and other charges after tax | 47 | 46 |
Divested Businesses |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges after tax | 41 |  |
Severance costs | 7 |  |
Reversal Of Forfeited Executive Stock Compensation |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges | (6) |  |
Restructuring and other charges after tax and noncontrolling interests | 4 |  |
Other Miscellaneous Charges |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges | 12 | 11 | 7
Restructuring and other charges after tax |  | 8 | 4
Restructuring and other charges after tax and noncontrolling interests | 7 |  |
Other Adjustments |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges | (11) | 25 | 8
Restructuring and other charges after tax |  | 12 | 3
Restructuring and other charges after tax and noncontrolling interests | $ 8 |  |
Restructuring Programs Layoffs Two Thousand Seventeen |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Number of employees associated with layoff costs | employee | 880 |  |
Approximate number of employees already laid off | employee | 300 |  |
Restructuring charges for layoffs | $ 28 |  |
Fusina Italy |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges | 60 |  |
Restructuring and other charges after tax and noncontrolling interests | 60 |  |
Corporate |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges | $ 11 | $ 23 | 39
Number of employees associated with layoff costs | position | 100 |  |
Latin America Extrusions (LAE) | Divested Businesses |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges | $ 41 |  |
Engineered Products and Solutions |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Number of employees associated with layoff costs | position | 400 |  |
Global Rolled Products |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Number of employees associated with layoff costs | position | 245 |  |
Global Rolled Products | Divested Businesses |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges |  |  | 136
Restructuring and other charges after tax |  |  | $ 134
Transportation and Construction Solutions |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Number of employees associated with layoff costs | position | 135 |  |

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