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Acquisitions and Divestitures Acquisitions and Divestitures - 2019 Divestitures (Details) $ in Millions |  |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 01, 2020 USD ($) employee | Dec. 01, 2019 USD ($) employee | Aug. 15, 2019 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Oct. 30, 2019 USD ($) | May 31, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Gain (loss) on disposition of business, before tax |  |  |  |  | $ 20 | $ 109 | $ (57) |  |
Non-cash asset impairments |  |  |  |  | 570 | 13 | 58 |  |
Restricted cash |  |  |  |  | 55 | 6 | 4 |  |
Restructuring and other charges |  |  |  |  | 620 | 9 | 165 |  |
Small Additive Manufacturing Facility | Engineered Products and Forgings |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Gain (loss) on disposition of business, before tax |  |  |  |  | (13) |  |  |  |
Consideration |  |  |  |  |  |  |  |  | $ 1
Proceeds from divestiture of businesses |  |  | $ 13 |  |  |  |  |  |
Non-cash asset impairments |  |  |  |  | 10 |  |  |  |
Alloy Extrusions | Global Rolled Products |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Consideration |  |  |  |  |  |  |  | $ 61 |
Forgings Business | Engineered Products and Forgings |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Gain (loss) on disposition of business, before tax |  | $ (46) |  |  |  |  |  |  |
Consideration |  | $ 64 |  |  |  |  |  |  |
Restricted cash |  |  |  |  | 53 |  |  |  |
Sales |  |  |  |  | 116 | 131 | 127 |  |
Aluminum Rolling Mill | Global Rolled Products |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Non-cash asset impairments |  |  |  |  | 53 |  |  |  |
Sales |  |  |  |  | $ 143 | $ 179 | $ 162 |  |
Number of employees | employee |  | 540 |  |  |  |  |  |  |
Scenario, Forecast | Minimum | Alloy Extrusions | Global Rolled Products |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Gain (loss) on disposition of business, before tax |  |  |  | $ 25 |  |  |  |  |
Scenario, Forecast | Maximum | Alloy Extrusions | Global Rolled Products |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Gain (loss) on disposition of business, before tax |  |  |  | $ 30 |  |  |  |  |
Subsequent Event | Aluminum Rolling Mill | Global Rolled Products |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Consideration | $ 50 |  |  |  |  |  |  |  |
Number of employees | employee | 513 |  |  |  |  |  |  |  |

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