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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, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales | $ 1,238 | $ 1,134 | $ 1,253 | $ 1,634 | $ 1,734 | $ 1,794 | $ 1,818 | $ 1,752 | $ 5,259 | $ 7,098 | $ 6,778
Segment operating profit |  |  |  |  |  |  |  |  | 626 | 579 | 775
Restructuring and other charges (E) |  |  |  |  |  |  |  |  | 182 | 582 | 163
Provision for depreciation and amortization |  |  |  |  |  |  |  |  | 279 | 295 | 314
Capital expenditures |  |  |  |  |  |  |  |  | 267 | 641 | 768
Total Assets | (11,443) |  |  |  | (17,562) |  |  |  | (11,443) | (17,562) |
Third-party sales |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 5,257 | 7,105 | 6,798
Inter-segment sales |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | (12) | (24) | (35)
Total segment sales |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 5,269 | 7,129 | 6,833
Segment operating profit |  |  |  |  |  |  |  |  | 890 | 1,390 | 1,105
Restructuring and other charges (E) |  |  |  |  |  |  |  |  | 106 | 506 | 59
Provision for depreciation and amortization |  |  |  |  |  |  |  |  | 262 | 269 | 289
Capital expenditures |  |  |  |  |  |  |  |  | 158 | 344 | 407
Total Assets | (9,535) |  |  |  | (10,035) |  |  |  | (9,535) | (10,035) |
Engine Products | Third-party sales |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 2,406 | 3,320 | 3,092
Engine Products | Inter-segment sales |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | (5) | (11) | (16)
Engine Products | Total segment sales |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 2,411 | 3,331 | 3,108
Segment operating profit |  |  |  |  |  |  |  |  | 417 | 621 | 464
Restructuring and other charges (E) |  |  |  |  |  |  |  |  | 36 | 297 | 47
Provision for depreciation and amortization |  |  |  |  |  |  |  |  | 123 | 131 | 141
Capital expenditures |  |  |  |  |  |  |  |  | 77 | 211 | 217
Total Assets | (4,756) |  |  |  | (5,445) |  |  |  | (4,756) | (5,445) |
Fastening Systems | Third-party sales |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 1,245 | 1,561 | 1,531
Fastening Systems | Inter-segment sales |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 0 | 0 | 0
Fastening Systems | Total segment sales |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 1,245 | 1,561 | 1,531
Segment operating profit |  |  |  |  |  |  |  |  | 247 | 396 | 357
Restructuring and other charges (E) |  |  |  |  |  |  |  |  | 39 | 6 | 17
Provision for depreciation and amortization |  |  |  |  |  |  |  |  | 48 | 48 | 48
Capital expenditures |  |  |  |  |  |  |  |  | 39 | 36 | 47
Total Assets | (2,707) |  |  |  | (2,810) |  |  |  | (2,707) | (2,810) |
Engineered Structures | Third-party sales |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 927 | 1,255 | 1,209
Engineered Structures | Inter-segment sales |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | (7) | (13) | (19)
Engineered Structures | Total segment sales |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 934 | 1,268 | 1,228
Segment operating profit |  |  |  |  |  |  |  |  | 73 | 120 | 64
Restructuring and other charges (E) |  |  |  |  |  |  |  |  | 28 | 199 | (5)
Provision for depreciation and amortization |  |  |  |  |  |  |  |  | 52 | 58 | 69
Capital expenditures |  |  |  |  |  |  |  |  | 19 | 27 | 53
Total Assets | (1,444) |  |  |  | (1,151) |  |  |  | (1,444) | (1,151) |
Forged Wheels | Third-party sales |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 679 | 969 | 966
Forged Wheels | Inter-segment sales |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 0 | 0 | 0
Forged Wheels | Total segment sales |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 679 | 969 | 966
Segment operating profit |  |  |  |  |  |  |  |  | 153 | 253 | 220
Restructuring and other charges (E) |  |  |  |  |  |  |  |  | 3 | 4 | 0
Provision for depreciation and amortization |  |  |  |  |  |  |  |  | 39 | 32 | 31
Capital expenditures |  |  |  |  |  |  |  |  | 23 | 70 | $ 90
Total Assets | $ (628) |  |  |  | $ (629) |  |  |  | $ (628) | $ (629) |

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