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Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Sep. 30, 2019
Goodwill [Roll Forward] |  |  |  |
Goodwill gross, beginning balance | $ 5,247 | $ 5,282 |  |
Accumulated impairment losses | (747) | (747) |  |
Goodwill, net | 4,500 | 4,535 |  |
Acquisitions and Divestitures | (13) | (1) |  |
Translation and other | 6 | (34) |  |
Transfer from Engineered Structures to Aluminum Extrusions | 0 |  |  |
Goodwill gross, ending balance | 5,240 | 5,247 |  |
Accumulated impairment losses | (747) | (747) |  |
Goodwill, ending balance | 4,500 | 4,535 | $ 4,493 |
Engineered Products and Forgings |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, net | 4,186 |  |  |
Acquisitions and Divestitures | (13) |  |  |
Goodwill, ending balance | 4,186 |  | 4,067 | $ 7
Global Rolled Products |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, net | 314 |  |  |
Acquisitions and Divestitures | 0 |  |  |
Goodwill, ending balance | 314 |  | 426 | $ 68
Latin America Extrusions (LAE) |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill gross, ending balance | 25 |  |  |
Total segment sales | Engineered Products and Forgings |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill gross, beginning balance | 4,905 | 4,931 |  |
Accumulated impairment losses | (719) | (719) |  |
Goodwill, net | 4,186 | 4,212 |  |
Acquisitions and Divestitures |  | (1) |  |
Translation and other | 4 | (25) |  |
Transfer from Engineered Structures to Aluminum Extrusions | (110) |  |  |
Goodwill gross, ending balance | 4,786 | 4,905 |  |
Accumulated impairment losses | (719) | (719) |  |
Goodwill, ending balance | 4,186 | 4,212 | 4,067 |
Total segment sales | Global Rolled Products |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill gross, beginning balance | 342 | 351 |  |
Accumulated impairment losses | (28) | (28) |  |
Goodwill, net | 314 | 323 |  |
Acquisitions and Divestitures |  | 0 |  |
Translation and other | 2 | (9) |  |
Transfer from Engineered Structures to Aluminum Extrusions | 110 |  |  |
Goodwill gross, ending balance | 454 | 342 |  |
Accumulated impairment losses | (28) | (28) |  |
Goodwill, ending balance | $ 314 | $ 323 | $ 426 |

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