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Segment and Geographic Area Information - Schedule of Operating Results of Arconic's Reportable Segment (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total sales | $ 3,271 | $ 3,236 | $ 3,261 | $ 3,192 | $ 2,967 | $ 3,138 | $ 3,234 | $ 3,055 | $ 12,960 | $ 12,394 | $ 12,413
Depreciation and amortization |  |  |  |  |  |  |  |  | 523 | 504 | 479
Adjusted EBITDA |  |  |  |  |  |  |  |  | 2,144 | 2,063 | 1,894
Capital expenditures |  |  |  |  |  |  |  |  | 543 | 689 |
Goodwill | 4,202 |  |  |  | 4,817 |  |  |  | 4,202 | 4,817 |
Total assets | 15,499 |  |  |  | 15,415 |  |  |  | 15,499 | 15,415 |
Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  | 13,060 | 12,512 | 12,602
Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intersegment sales |  |  |  |  |  |  |  |  | 148 | 118 | 125
Total sales |  |  |  |  |  |  |  |  | (148) | (118) | (125)
Third-Party Sales | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information Revenues From External Customers |  |  |  |  |  |  |  |  | 12,912 | 12,394 | 12,477
Engineered Products and Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 268 | 255 | 233
Adjusted EBITDA |  |  |  |  |  |  |  |  | 1,224 | 1,195 | 1,111
Capital expenditures |  |  |  |  |  |  |  |  | 308 | 333 |
Goodwill | 3,949 |  |  |  | 4,579 |  |  |  | 3,949 | 4,579 |
Total assets | 10,252 |  |  |  | 10,542 |  |  |  | 10,252 | 10,542 |
Engineered Products and Solutions | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  | 5,935 | 5,728 | 5,342
Engineered Products and Solutions | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intersegment sales |  |  |  |  |  |  |  |  | 0 | 0 | 0
Engineered Products and Solutions | Third-Party Sales | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information Revenues From External Customers |  |  |  |  |  |  |  |  | 5,935 | 5,728 | 5,342
Global Rolled Products |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 205 | 201 | 203
Adjusted EBITDA |  |  |  |  |  |  |  |  | 599 | 577 | 512
Capital expenditures |  |  |  |  |  |  |  |  | 178 | 293 |
Goodwill | 193 |  |  |  | 181 |  |  |  | 193 | 181 |
Total assets | 4,179 |  |  |  | 3,891 |  |  |  | 4,179 | 3,891 |
Global Rolled Products | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  | 5,140 | 4,982 | 5,378
Global Rolled Products | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intersegment sales |  |  |  |  |  |  |  |  | 148 | 118 | 125
Global Rolled Products | Third-Party Sales | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information Revenues From External Customers |  |  |  |  |  |  |  |  | 4,992 | 4,864 | 5,253
Transportation and Construction Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 50 | 48 | 43
Adjusted EBITDA |  |  |  |  |  |  |  |  | 321 | 291 | 271
Capital expenditures |  |  |  |  |  |  |  |  | 57 | 63 |
Goodwill | 60 |  |  |  | 57 |  |  |  | 60 | 57 |
Total assets | $ 1,068 |  |  |  | $ 982 |  |  |  | 1,068 | 982 |
Transportation and Construction Solutions | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  | 1,985 | 1,802 | 1,882
Transportation and Construction Solutions | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intersegment sales |  |  |  |  |  |  |  |  | 0 | 0 | 0
Transportation and Construction Solutions | Third-Party Sales | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information Revenues From External Customers |  |  |  |  |  |  |  |  | $ 1,985 | $ 1,802 | $ 1,882

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