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Restructuring and Other Charges - 2015 Actions (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) employee | Dec. 31, 2014 divestiture
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | $ 165 | $ 155 | $ 214 |
Restructuring and other charges after tax and noncontrolling interest | 143 | 114 | 192 |
Corporate |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | 11 | 23 | 39 |
Divested Businesses |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges after tax and noncontrolling interest | 41 |  |  |
Number of plant divestitures | divestiture |  |  |  | 3
Divested Businesses | Global Rolled Products |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges |  |  | 136 |
Restructuring and other charges after tax and noncontrolling interest |  |  | 134 |
Restructuring Programs Layoffs Two Thousand Fourteen |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges |  |  | 97 |
Restructuring and other charges after tax and noncontrolling interest |  |  | $ 70 |
Number of positions | employee |  |  | 1,505 |
Restructuring Programs Layoffs Two Thousand Fourteen | Corporate |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of positions | employee |  |  | 400 |
Restructuring Programs Layoffs Two Thousand Fourteen | Global Rolled Products |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of positions | employee |  |  | 90 |
Restructuring Programs Layoffs Two Thousand Fourteen | Engineered Products and Solutions |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of positions | employee |  |  | 590 |
Restructuring Programs Layoffs Two Thousand Fourteen | Transportation and Construction Solutions |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of positions | employee |  |  | 425 |
Restructuring Programs Layoffs 2015 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges for layoffs | 5 | 55 | $ 18 |
Shutdown and Curtailment Actions |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges |  | 37 |  |
Restructuring and other charges after tax and noncontrolling interest |  | 24 |  |
Shutdown and Curtailment Actions | Australia |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Gain on sale of land |  |  | 18 |
Gain on sale of land after tax |  |  | 13 |
Other Miscellaneous Charges |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | 12 | 11 | 7 |
Restructuring and other charges after tax and noncontrolling interest |  | 8 | 4 |
Other Adjustments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | $ (11) | 25 | 8 |
Restructuring and other charges after tax and noncontrolling interest |  | $ 12 | $ 3 |

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