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Restructuring and Other Charges - 2018 Actions (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) position | 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
Gain on disposition of assets, after tax |  |  | 81 |  |
Gain (loss) on disposition of business, before tax |  |  | 109 | (57) | (3)
Gain (loss) on disposition of assets, before tax |  |  | (10) | $ 513 | (11)
Number of employees associated with layoff costs | position |  |  |  | 880 |
Cash payments for restructuring |  |  | 49 | $ 65 | 86
Engineered Products and Solutions |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Number of employees associated with layoff costs | position |  |  |  | 400 |
Corporate Segment |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Number of employees associated with layoff costs | position |  |  |  | 100 |
Pension Settlement Cost |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other charges |  | $ 96 | 96 |  | 2
Restructuring and other charges after tax |  |  | 75 |  | 1
Pension Curtailment Charge |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other charges |  |  | 23 |  |
Restructuring and other charges after tax and noncontrolling interests |  |  | 18 |  |
Postretirement Curtailment Benefit |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other charges |  |  | 28 |  |
Restructuring and other charges after tax |  |  | 22 |  |
Restructuring Programs Layoffs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other charges |  |  | 20 |  |
Restructuring and other charges after tax |  |  | $ 17 |  |
Restructuring Programs Layoffs Two Thousand Eighteen |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Approximate number of employees already laid off | position |  | 110 | 110 |  |
Number of employees associated with layoff costs | position |  |  | 125 |  |
Cash payments for restructuring |  |  | $ 9 |  |
Restructuring Programs Layoffs Two Thousand Eighteen | Engineered Products and Solutions |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Number of employees associated with layoff costs | position |  |  | 89 |  |
Restructuring Programs Layoffs Two Thousand Eighteen | Corporate Segment |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Number of employees associated with layoff costs | position |  |  | 36 |  |
Facility Closing |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other charges |  |  | $ 12 |  |
Restructuring and other charges after tax |  |  | 9 |  |
Other Adjustments |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other charges |  |  | 8 | $ (11) | 25
Restructuring and other charges after tax and noncontrolling interests |  |  | 4 | (8) |
Restructuring and other charges after tax |  |  |  |  | 12
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
Texarkana, Texas Rolling Mill And Cast House |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Gain on disposition of assets, after tax |  |  | 119 |  |
Gain (loss) on disposition of business, before tax | $ 154 |  |  |  |
Texarkana, Texas Rolling Mill |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Gain on disposition of assets, after tax |  | $ 119 |  |  |
Gain (loss) on disposition of business, before tax |  | 154 |  |  |
Gain (loss) on disposition of assets, before tax |  |  | 154 |  |
Eger |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other charges after tax |  |  | 39 |  |
Gain on disposition of assets, after tax |  | (39) |  |  |
Gain (loss) on disposition of business, before tax |  | $ (43) | (43) |  |
New York office | Facility Closing |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other charges |  |  | 6 |  |
Restructuring and other charges after tax |  |  | $ 4 |  |

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