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Segment Information - Schedule of Operating Results of Arconic's Reportable Segment (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |
Total sales | $ 5,213 | $ 5,573 | $ 15,455 | $ 17,289
Equity (loss) income | (16) | (24) | (54) | (66)
Depreciation, depletion, and amortization | 301 | 305 | 894 | 918
Income taxes | 137 | 153 | 470 | 644
After-tax operating income (ATOI) | 395 | 410 | 1,130 | 1,633
Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 5,969 | 6,459 | 17,805 | 20,420
Intersegment Eliminations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment sales | 757 | 899 | 2,355 | 3,155
Third-Party Sales [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Third-party sales | 5,212 | 5,560 |  | 17,265
Alumina [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Equity (loss) income | (9) | (9) | (30) | (27)
Depreciation, depletion, and amortization | 68 | 71 | 197 | 228
Income taxes | 31 | 85 | 76 | 264
After-tax operating income (ATOI) | 72 | 212 | 189 | 648
Alumina [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 974 | 1,303 | 2,805 | 4,046
Alumina [Member] | Intersegment Eliminations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment sales | 287 | 391 | 879 | 1,323
Alumina [Member] | Third-Party Sales [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Third-party sales | 687 | 912 | 1,926 | 2,723
Primary Metals [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Equity (loss) income | 3 | (7) | 7 | (15)
Depreciation, depletion, and amortization | 99 | 106 | 302 | 324
Income taxes |  | (49) | (16) | 14
After-tax operating income (ATOI) | 56 | (59) | 111 | 195
Primary Metals [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 1,588 | 1,728 | 4,778 | 6,088
Primary Metals [Member] | Intersegment Eliminations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment sales | 440 | 479 | 1,388 | 1,733
Primary Metals [Member] | Third-Party Sales [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Third-party sales | 1,148 | 1,249 | 3,390 | 4,355
Global Rolled Products [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Equity (loss) income | (10) | (8) | (31) | (24)
Depreciation, depletion, and amortization | 59 | 56 | 170 | 168
Income taxes | 18 | 28 | 80 | 89
After-tax operating income (ATOI) | 58 | 62 | 194 | 192
Global Rolled Products [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 1,551 | 1,556 | 4,556 | 4,915
Global Rolled Products [Member] | Intersegment Eliminations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment sales | 30 | 29 | 88 | 99
Global Rolled Products [Member] | Third-Party Sales [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Third-party sales | 1,521 | 1,527 | 4,468 | 4,816
Engineered Products and Solutions [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation, depletion, and amortization | 63 | 61 | 190 | 166
Income taxes | 71 | 71 | 236 | 228
After-tax operating income (ATOI) | 162 | 151 | 504 | 472
Engineered Products and Solutions [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 1,406 | 1,397 | 4,320 | 3,933
Engineered Products and Solutions [Member] | Third-Party Sales [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Third-party sales | 1,406 | 1,397 | 4,320 | 3,933
Transportation and Construction Solutions [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation, depletion, and amortization | 12 | 11 | 35 | 32
Income taxes | 17 | 18 | 49 | 49
After-tax operating income (ATOI) | 47 | 44 | 132 | 126
Transportation and Construction Solutions [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 450 | 475 |  | 1,438
Transportation and Construction Solutions [Member] | Third-Party Sales [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Third-party sales | $ 450 | $ 475 | $ 1,346 | $ 1,438

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