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Restructuring and Other Charges - Narrative (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 USD ($) employee position | Sep. 30, 2017 USD ($) position | Sep. 30, 2018 USD ($) employee position | Sep. 30, 2017 USD ($) position | Dec. 31, 2017 USD ($) employee
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other charges | $ (2) | $ 19 | $ 20 | $ 118 |
Restructuring and other charges after tax and noncontrolling interest | $ 3 | $ 13 | $ 14 | $ 99 |
Number of employees associated with layoff costs | position | 85 | 124 | 125 | 800 |
Reversal of forfeited executive stock compensation |  |  |  | $ 13 |
Severance costs |  |  |  | $ 7 |
Cash payments made against the layoff reserves |  |  | $ 38 |  | $ 65
Reversals of previously recorded layoff |  |  | 10 |  | $ 11
Minimum amount of cash payments expected to be paid beyond the end of the current annual period |  |  | 18 |  |
Maximum amount of cash payments expected to be paid beyond the end of the current annual period |  |  | $ 20 |  |
Engineered Products and Solutions |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Number of employees associated with layoff costs | position | 65 | 111 | 89 | 350 |
Global Rolled Products |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Number of employees associated with layoff costs | position |  | 1 |  | 243 |
Transportation and Construction Solutions |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Number of employees associated with layoff costs | position |  |  |  | 133 |
Corporate |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Number of employees associated with layoff costs | position | 20 | 12 | 36 | 74 |
Acuna, Mexico |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other charges | $ 12 |  | $ 12 |  |
Restructuring and other charges after tax | 9 |  | 9 |  |
New York office |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other charges |  |  | 5 |  |
Restructuring and other charges after tax |  |  | 4 |  |
Fusina, Italy |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other charges |  |  |  | $ 60 |
Restructuring and other charges after tax |  |  |  | 60 |
Postretirement Curtailment Benefit |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other charges | 28 |  | 28 |  |
Restructuring and other charges after tax | 22 |  | 22 |  |
Restructuring Programs Layoffs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other charges | 8 | $ 11 | 16 | 59 |
Restructuring and other charges after tax | 6 | 8 | 12 | 40 |
Pension Settlement |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other charges | 4 |  | 4 |  |
Restructuring and other charges after tax | 3 |  | 3 |  |
Other Miscellaneous Items |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other charges | 3 | 8 | 7 | 7 |
Restructuring and other charges after tax | 2 | $ 5 | 5 | 5 |
Other Adjustments |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other charges | 1 |  | 10 | 2 |
Restructuring and other charges after tax and noncontrolling interest | $ 1 |  | 8 | 2 |
Pension Curtailment Charge |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other charges |  |  | 14 |  |
Restructuring and other charges after tax |  |  | $ 11 |  |
Reversal of Forfeited Executive Stock Compensation |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other charges |  |  |  | 6 |
Restructuring and other charges after tax |  |  |  | $ 4 |
Restructuring Programs Layoffs 2018 |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Number of employees associated with layoff costs | employee |  |  | 125 |  |
Approximate number of employees already laid off | employee | 35 |  | 35 |  |
Cash payments made against the layoff reserves | $ 3 |  | $ 6 |  |
Restructuring Programs Layoffs 2017 |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Number of employees associated with layoff costs | employee |  |  | 760 |  | 830
Approximate number of employees already laid off | employee | 570 |  | 570 |  |
Cash payments made against the layoff reserves | $ 4 |  | $ 27 |  |
Restructuring Programs Layoffs 2016 |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Cash payments made against the layoff reserves | $ 0 |  | $ 4 |  |

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