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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales | $ 3,472 | $ 3,524 | $ 3,573 | $ 3,445 | $ 3,271 | $ 3,236 | $ 3,261 | $ 3,192 | $ 14,014 | $ 12,960 | $ 12,394
Restructuring and other charges |  |  |  |  |  |  |  |  | 9 | 165 | 155
Provision for depreciation and amortization |  |  |  |  |  |  |  |  | 576 | 551 | 1,132
Capital expenditures |  |  |  |  |  |  |  |  | 715 | 543 |
Goodwill | 4,500 |  |  |  | 4,535 |  |  |  | 4,500 | 4,535 | 5,148
Assets | 18,693 |  |  |  | 18,718 |  |  |  | 18,693 | 18,718 |
Total segment sales |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 14,206 | 13,102 | 12,513
Segment operating profit |  |  |  |  |  |  |  |  | 1,581 | 1,678 | 1,622
Restructuring and other charges |  |  |  |  |  |  |  |  | (84) | 154 | 132
Provision for depreciation and amortization |  |  |  |  |  |  |  |  | 544 | 523 | 504
Assets | 15,369 |  |  |  | 15,321 |  |  |  | 15,369 | 15,321 |
Total segment sales | Third-Party Sales |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 14,046 | 12,954 | 12,395
Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 160 | 148 | 118
Engineered Products and Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 6,316 | 5,943 | 5,728
Capital expenditures |  |  |  |  |  |  |  |  | 349 | 308 |
Goodwill | 4,179 |  |  |  | 4,205 |  |  |  | 4,179 | 4,205 |
Assets | 10,346 |  |  |  | 10,325 |  |  |  | 10,346 | 10,325 |
Engineered Products and Solutions | Total segment sales |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 6,316 | 5,943 | 5,728
Segment operating profit |  |  |  |  |  |  |  |  | 891 | 964 | 955
Restructuring and other charges |  |  |  |  |  |  |  |  | 71 | 30 | 78
Provision for depreciation and amortization |  |  |  |  |  |  |  |  | 282 | 268 | 255
Goodwill | 4,179 |  |  |  | 4,205 |  |  |  | 4,179 | 4,205 | 4,832
Engineered Products and Solutions | Total segment sales | Third-Party Sales |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 6,316 | 5,943 | 5,728
Engineered Products and Solutions | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 0 | 0 | 0
Global Rolled Products |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 5,604 | 5,000 | 4,865
Capital expenditures |  |  |  |  |  |  |  |  | 255 | 178 |
Goodwill | 245 |  |  |  | 252 |  |  |  | 245 | 252 |
Assets | 3,934 |  |  |  | 3,955 |  |  |  | 3,934 | 3,955 |
Global Rolled Products | Total segment sales |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 5,764 | 5,148 | 4,983
Segment operating profit |  |  |  |  |  |  |  |  | 386 | 424 | 421
Restructuring and other charges |  |  |  |  |  |  |  |  | (156) | 72 | 40
Provision for depreciation and amortization |  |  |  |  |  |  |  |  | 212 | 205 | 201
Goodwill | 245 |  |  |  | 252 |  |  |  | 245 | 252 | 241
Global Rolled Products | Total segment sales | Third-Party Sales |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 5,604 | 5,000 | 4,865
Global Rolled Products | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 160 | 148 | 118
Transportation and Construction Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 2,126 | 2,011 | 1,802
Capital expenditures |  |  |  |  |  |  |  |  | 111 | 57 |
Goodwill | 76 |  |  |  | 78 |  |  |  | 76 | 78 |
Assets | 1,089 |  |  |  | 1,041 |  |  |  | 1,089 | 1,041 |
Transportation and Construction Solutions | Total segment sales |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 2,126 | 2,011 | 1,802
Segment operating profit |  |  |  |  |  |  |  |  | 304 | 290 | 246
Restructuring and other charges |  |  |  |  |  |  |  |  | 1 | 52 | 14
Provision for depreciation and amortization |  |  |  |  |  |  |  |  | 50 | 50 | 48
Goodwill | $ 76 |  |  |  | $ 78 |  |  |  | 76 | 78 | 75
Transportation and Construction Solutions | Total segment sales | Third-Party Sales |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 2,126 | 2,011 | 1,802
Transportation and Construction Solutions | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0

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