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Restructuring and Other Charges - 2017 Actions (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) position | Dec. 31, 2017 USD ($) position | Dec. 31, 2016 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges | $ 9 | $ 165 | $ 155
Restructuring and other charges after tax | 9 | $ 143 | 114
Number of employees associated with layoff costs | position |  | 880 |
Reversal of forfeited executive stock compensation |  | $ 13 |
Severance costs | 20 | 64 | 68
Cash payments for restructuring | 49 | 65 | 86
Other Exit Costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges | 19 | 69 | 57
Restructuring and other charges after tax | 15 | 47 | 46
Cash payments for restructuring | 2 | 6 | 13
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
Restructuring and other charges after tax |  |  | 8
Restructuring and other charges after tax and noncontrolling interests |  | 7 |
Other Adjustments |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges | 8 | (11) | 25
Restructuring and other charges after tax |  |  | $ 12
Restructuring and other charges after tax and noncontrolling interests | $ 4 | $ (8) |
Restructuring Programs Layoffs Two Thousand Seventeen |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Number of employees associated with layoff costs | position | 660 | 760 |
Approximate number of employees already laid off | position | 570 |  |
Cash payments for restructuring | $ 34 |  |
Fusina Italy |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges |  | $ 60 |
Restructuring and other charges after tax and noncontrolling interests |  | 60 |
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 |
Transportation and Construction Solutions |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Number of employees associated with layoff costs | position |  | 135 |
Corporate Segment |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Number of employees associated with layoff costs | position |  | 100 |

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