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Segment and Geographic Area Information - Schedule of Operating Results of Arconic's Reportable Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales | $ (3,401) | $ (3,559) | $ (3,691) | $ (3,541) | $ (3,472) | $ (3,524) | $ (3,573) | $ (3,445) | $ (14,192) | $ (14,014) | $ (12,960)
Capital expenditures |  |  |  |  |  |  |  |  | 533 | 715 |
Goodwill | 4,493 |  |  |  | 4,500 |  |  |  | 4,493 | 4,500 | 4,535
Assets | 17,578 |  |  |  | 18,693 |  |  |  | 17,578 | 18,693 |
Segment operating profit |  |  |  |  |  |  |  |  | 2,015 | 1,586 | 1,689
Restructuring and other charges |  |  |  |  |  |  |  |  | 590 |  |
Provision for depreciation and amortization |  |  |  |  |  |  |  |  | 502 |  |
Non-cash asset impairments |  |  |  |  |  |  |  |  | 570 | 13 | 58
Total segment sales |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | (14,370) | (14,226) | (13,023)
Assets | 14,941 |  |  |  | 15,339 |  |  |  | 14,941 | 15,339 |
Segment operating profit |  |  |  |  |  |  |  |  |  | 1,586 | 1,689
Restructuring and other charges |  |  |  |  |  |  |  |  |  | (87) | 113
Provision for depreciation and amortization |  |  |  |  |  |  |  |  |  | 542 | 518
Total segment sales | Third-Party Sales |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | (14,187) | (14,021) | (12,840)
Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 183 | 205 | 183
Engineered Products and Forgings |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 344 | 407 |
Goodwill | 4,067 | 7 |  |  | 4,186 |  |  |  | 4,067 | 4,186 |
Assets | 10,034 |  |  |  | 10,494 |  |  |  | 10,034 | 10,494 |
Segment operating profit |  |  |  |  |  |  |  |  | 1,390 | 1,105 |
Restructuring and other charges |  |  |  |  |  |  |  |  | 509 | 70 |
Provision for depreciation and amortization |  |  |  |  |  |  |  |  | 269 | 289 |
Engineered Products and Forgings | Total segment sales |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | (7,105) | (6,798) | (6,300)
Goodwill | 4,067 |  |  |  | 4,186 |  |  |  | 4,067 | 4,186 | 4,212
Segment operating profit |  |  |  |  |  |  |  |  |  |  | 1,119
Restructuring and other charges |  |  |  |  |  |  |  |  |  |  | 30
Provision for depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 275
Engineered Products and Forgings | Total segment sales | Third-Party Sales |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | (7,105) | (6,798) | (6,300)
Engineered Products and Forgings | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 0 | 0 | 0
Global Rolled Products |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | (7,082) | (7,223) | (6,540)
Capital expenditures |  |  |  |  |  |  |  |  | 189 | 308 |
Goodwill | 426 | $ 68 |  |  | 314 |  |  |  | 426 | 314 |
Assets | 4,907 |  |  |  | 4,845 |  |  |  | 4,907 | 4,845 |
Segment operating profit |  |  |  |  |  |  |  |  | 625 | 481 |
Restructuring and other charges |  |  |  |  |  |  |  |  | 81 | (157) |
Provision for depreciation and amortization |  |  |  |  |  |  |  |  | 233 | 253 |
Global Rolled Products | Total segment sales |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | (7,265) | (7,428) | (6,723)
Goodwill | 426 |  |  |  | $ 314 |  |  |  | 426 | 314 | 323
Segment operating profit |  |  |  |  |  |  |  |  |  |  | 570
Restructuring and other charges |  |  |  |  |  |  |  |  |  |  | 83
Provision for depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 243
Global Rolled Products | Total segment sales | Third-Party Sales |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | (7,082) | (7,223) | (6,540)
Global Rolled Products | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 183 | $ 205 | $ 183
Arconic Engines |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 2,164 |  |  |  |  |  |  |  | $ 2,164 |  |
Non-cash asset impairments |  |  | $ 428 |  |  |  |  |  |  |  |

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