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Restructuring and Other Charges - Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 USD ($) employee position | Mar. 31, 2019 USD ($) employee | Dec. 31, 2019 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | $ 21 | $ 12 |
Restructuring and other charges (benefits) after tax | 23 | 10 |
Gain on sale of assets | (2) | (2) |
Cash payments for restructuring | 7 |  | $ 79
Extrusions Busines |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Gain (loss) on sale of business | 27 |  |
Gain on sale of business, net of tax | 20 |  |
Layoff costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 22 | 65 |
Restructuring and other charges (benefits) after tax | 17 | $ 51 |
Cash payments for restructuring | $ 7 |  | $ 74
Restructuring Programs Layoffs 2020 |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Number of employees associated with layoff costs | employee | 460 |  |
Approximate number of employees already laid off | employee | 0 |  |
Impairments Of Assets Associated With Agreement To Sell Aerospace Components Business |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | $ 12 |  |
Restructuring and other charges (benefits) after tax | 12 |  |
UK Forgings |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 6 |  |
Restructuring and other charges (benefits) after tax | 6 |  |
Sale Of Company's Brazilian Rolling Mill Operations |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 6 |  |
Restructuring and other charges (benefits) after tax | 6 |  |
Other Exit Costs Related To Prior Programs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 6 |  |
Restructuring and other charges (benefits) after tax | 6 |  |
Reversal Of Prior Period Programs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | (2) |  |
Restructuring and other charges (benefits) after tax | (2) |  |
Sale Of Assets |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Gain on sale of assets | 2 |  |
Gain on sale of assets, net of tax | $ 2 |  |
Restructuring Programs Layoffs 2019 |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Number of employees associated with layoff costs | 1,310 | 800 |
Approximate number of employees already laid off | position | 1,053 |  |
Cash payments for restructuring | $ 7 |  |
Executive Severance Net Of The Benefit Of Forfeited Executive Stock Compensation |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges |  | $ 2 |
Restructuring and other charges (benefits) after tax |  | 1 |
Pension Settlement Cost |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges |  | 2 |
Restructuring and other charges (benefits) after tax |  | 2 |
Other Miscellaneous Charges |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges |  | 1 |
Restructuring and other charges (benefits) after tax |  | 1 |
Elimination Of Life Insurance Benefits |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges |  | (58) |
Restructuring and other charges (benefits) after tax |  | $ (45) |
Engineered Products and Forgings | Restructuring Programs Layoffs 2020 |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Number of employees associated with layoff costs | employee | 440 |  |
Engineered Products and Forgings | Restructuring Programs Layoffs 2019 |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Number of employees associated with layoff costs | employee |  | 211 |
Corporate Segment | Restructuring Programs Layoffs 2020 |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Number of employees associated with layoff costs | employee | 20 |  |
Corporate Segment | Restructuring Programs Layoffs 2019 |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Number of employees associated with layoff costs | employee |  | 425 |
Global Rolled Products | Restructuring Programs Layoffs 2019 |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Number of employees associated with layoff costs | employee |  | 164 |

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