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Segment Information - Schedule of Operating Results of Arconic's Reportable Segments (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Total sales | $ 3,261 | $ 3,234 | $ 6,453 | $ 6,289
Depreciation and amortization | 129 | 124 | 255 | 250
Adjusted EBITDA | 556 | 568 | 1,105 | 1,092
Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 3,290 | 3,277 | 6,507 | 6,368
Intersegment Eliminations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment sales | 37 | 29 | 71 | 58
Third-Party Sales [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Third-party sales | 3,253 | 3,248 | 6,436 | 6,310
Engineered Products and Solutions [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 66 | 62 | 130 | 127
Adjusted EBITDA | 310 | 329 | 616 | 634
Engineered Products and Solutions [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 1,484 | 1,465 | 2,969 | 2,914
Engineered Products and Solutions [Member] | Third-Party Sales [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Third-party sales | 1,484 | 1,465 | 2,969 | 2,914
Global Rolled Products [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 51 | 50 | 101 | 100
Adjusted EBITDA | 164 | 163 | 335 | 318
Global Rolled Products [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 1,305 | 1,345 | 2,588 | 2,558
Global Rolled Products [Member] | Intersegment Eliminations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment sales | 37 | 29 | 71 | 58
Global Rolled Products [Member] | Third-Party Sales [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Third-party sales | 1,268 | 1,316 | 2,517 | 2,500
Transportation and Construction Solutions [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 12 | 12 | 24 | 23
Adjusted EBITDA | 82 | 76 | 154 | 140
Transportation and Construction Solutions [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 501 | 467 | 950 | 896
Transportation and Construction Solutions [Member] | Third-Party Sales [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Third-party sales | $ 501 | $ 467 | $ 950 | $ 896

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