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Segment Information - Schedule of Operating Results of Arconic's Reportable Segments (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Total sales | $ 3,236 | $ 3,138 | $ 9,689 | $ 9,427
Depreciation and amortization | 133 | 127 | 388 | 377
Adjusted EBITDA | 535 | 515 | 1,640 | 1,607
Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 3,263 | 3,171 | 9,770 | 9,539
Intersegment Eliminations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment sales | 36 | 30 | 107 | 88
Third-Party Sales [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Third-party sales | 3,227 | 3,141 | 9,663 | 9,451
Engineered Products and Solutions [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 68 | 63 | 198 | 190
Adjusted EBITDA | 312 | 296 | 928 | 930
Engineered Products and Solutions [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 1,476 | 1,406 | 4,445 | 4,320
Engineered Products and Solutions [Member] | Third-Party Sales [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Third-party sales | 1,476 | 1,406 | 4,445 | 4,320
Global Rolled Products [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 52 | 52 | 153 | 152
Adjusted EBITDA | 140 | 143 | 475 | 461
Global Rolled Products [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 1,270 | 1,315 | 3,858 | 3,873
Global Rolled Products [Member] | Intersegment Eliminations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment sales | 36 | 30 | 107 | 88
Global Rolled Products [Member] | Third-Party Sales [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Third-party sales | 1,234 | 1,285 | 3,751 | 3,785
Transportation and Construction Solutions [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 13 | 12 | 37 | 35
Adjusted EBITDA | 83 | 76 | 237 | 216
Transportation and Construction Solutions [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 517 | 450 | 1,467 | 1,346
Transportation and Construction Solutions [Member] | Third-Party Sales [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Third-party sales | $ 517 | $ 450 | $ 1,467 | $ 1,346

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