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Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2020
Goodwill [Roll Forward] |  |  |  |  |
Goodwill |  | $ 4,786,000,000 | $ 4,905,000,000 |  |
Accumulated impairment losses |  | (719,000,000) | (719,000,000) |  |
Goodwill (A and P) |  | 4,102,000,000 | 4,067,000,000 | $ 4,186,000,000 |
Acquisitions and Divestitures (See Note U) |  |  |  | (13,000,000) |
Impairment (See Note U) |  | 0 | (2,000,000) |  |
Translation and other |  |  | 37,000,000 | 4,000,000 |
Goodwill, Transfers |  |  | 0 | 0 |
Goodwill |  | 4,823,000,000 | 4,786,000,000 | 4,905,000,000 |
Transfer from Engineered Structures to Discontinued Operations (Arconic Corporation) |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, Transfers | $ 110,000,000 |  |  | (110,000,000) |
Engine Products |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill |  | 2,883,000,000 | 2,785,000,000 |  |
Accumulated impairment losses |  | (719,000,000) | (719,000,000) |  |
Goodwill (A and P) |  | 2,171,000,000 | 2,164,000,000 | 2,066,000,000 | $ 17,000,000
Acquisitions and Divestitures (See Note U) |  |  |  | (13,000,000) |
Impairment (See Note U) |  |  | 0 |  |
Translation and other |  |  | 24,000,000 | 6,000,000 |
Goodwill, Transfers |  |  | (17,000,000) | 105,000,000 |
Goodwill |  | 2,890,000,000 | 2,883,000,000 | 2,785,000,000 |
Engine Products | Transfer from Engineered Structures to Discontinued Operations (Arconic Corporation) |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, Transfers |  |  |  | 0 |
Fastening Systems |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill |  | 1,607,000,000 | 1,607,000,000 |  |
Accumulated impairment losses |  | 0 | 0 |  |
Goodwill (A and P) |  | 1,620,000,000 | 1,607,000,000 | 1,607,000,000 |
Acquisitions and Divestitures (See Note U) |  |  |  | 0 |
Impairment (See Note U) |  |  | 0 |  |
Translation and other |  |  | 13,000,000 | 0 |
Goodwill, Transfers |  |  | 0 | 0 |
Goodwill |  | 1,620,000,000 | 1,607,000,000 | 1,607,000,000 |
Fastening Systems | Transfer from Engineered Structures to Discontinued Operations (Arconic Corporation) |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, Transfers |  |  |  | 0 |
Engineered Structures |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill |  | 289,000,000 | 506,000,000 |  |
Accumulated impairment losses |  | 0 | 0 |  |
Goodwill (A and P) |  | 304,000,000 | 289,000,000 | 506,000,000 |
Acquisitions and Divestitures (See Note U) |  |  |  | 0 |
Impairment (See Note U) |  |  | (2,000,000) |  |
Translation and other |  |  | 0 | (2,000,000) |
Goodwill, Transfers |  |  | 17,000,000 | (105,000,000) |
Goodwill |  | 306,000,000 | 289,000,000 | 506,000,000 |
Engineered Structures | Transfer from Engineered Structures to Discontinued Operations (Arconic Corporation) |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, Transfers |  |  |  | (110,000,000) |
Forged Wheels |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill |  | 7,000,000 | 7,000,000 |  |
Accumulated impairment losses |  | 0 | 0 |  |
Goodwill (A and P) |  | 7,000,000 | 7,000,000 | 7,000,000 |
Acquisitions and Divestitures (See Note U) |  |  |  | 0 |
Impairment (See Note U) |  |  | 0 |  |
Translation and other |  |  | 0 | 0 |
Goodwill, Transfers |  |  | 0 | 0 |
Goodwill |  | $ 7,000,000 | $ 7,000,000 | 7,000,000 |
Forged Wheels | Transfer from Engineered Structures to Discontinued Operations (Arconic Corporation) |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, Transfers |  |  |  | $ 0 |

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