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Restructuring and Other Charges - 2018 Actions (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) position | Dec. 31, 2018 USD ($) position | Dec. 31, 2017 USD ($) position
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges |  |  |  | $ 620 | $ 9 | $ 165
Restructuring and other charges after tax |  |  |  | 512 | 9 | 143
Gain on disposition of assets, after tax |  |  |  |  | 81 |
Gain (loss) on disposition of business, before tax |  |  |  | 20 | 109 | (57)
Gain (loss) on disposition of assets, before tax |  |  |  | (7) | (10) | $ 513
Number of employees associated with layoff costs | position |  |  |  |  |  | 880
Cash payments for restructuring |  |  |  | 79 | 49 | $ 65
Engineered Products and Forgings |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of employees associated with layoff costs | position |  |  |  |  |  | 403
Pension Settlement Cost |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges |  |  |  | 9 | 96 |
Restructuring and other charges after tax |  |  |  | 7 | 75 |
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 |  |  |  | 103 | 20 |
Restructuring and other charges after tax |  |  |  | $ 78 | $ 17 |
Number of employees associated with layoff costs | position |  |  |  | 1,310 |  |
Restructuring Programs Layoffs Two Thousand Eighteen |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of employees associated with layoff costs | position |  |  |  |  | 125 |
Cash payments for restructuring |  |  |  | $ 4 | $ 9 |
Restructuring Programs Layoffs Two Thousand Eighteen | Engineered Products and Forgings |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of employees associated with layoff costs | position |  |  |  |  | 89 |
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)
Restructuring and other charges after tax and noncontrolling interests |  |  |  |  | 4 | (8)
Other Exit Costs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges |  |  |  | 26 | 19 | 69
Restructuring and other charges after tax |  |  |  | 21 | 15 | 47
Cash payments for restructuring |  |  |  | 5 | 2 | $ 6
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 | $ 20 |  |  |  |
Texarkana, Texas Rolling Mill |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Gain on disposition of assets, after tax |  | 15 | $ 119 | 17 |  |
Gain (loss) on disposition of business, before tax |  |  | 154 |  |  |
Gain (loss) on disposition of assets, before tax |  | $ 20 |  | 20 | 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) | (43) |
New York office | Facility Closing |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges |  |  |  |  | 6 |
Restructuring and other charges after tax |  |  |  |  | $ 4 |
Corporate |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of employees associated with layoff costs | position |  |  |  |  |  | 141
Corporate | Restructuring Programs Layoffs Two Thousand Eighteen |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of employees associated with layoff costs | position |  |  |  |  | 36 |

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