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Segment Information - Schedule of Operating Results of Arconic's Reportable Segments (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Total sales | $ 3,559 | $ 3,524 | $ 10,791 | $ 10,542
Segment operating profit | 524 | 391 | 1,511 | 1,225
Restructuring and other charges | 107 | 17 | 605 | 27
Provision for depreciation and amortization | 122 | 134 | 381 | 402
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 3,598 | 3,566 | 10,929 | 10,712
Intersegment sales |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 41 | 44 | 142 | 161
Third-party sales | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 3,557 | 3,522 | 10,787 | 10,551
Engineered Products and Forgings |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment operating profit | 363 | 284 | 1,036 | 837
Restructuring and other charges | 45 | 15 | 506 | 24
Provision for depreciation and amortization | 65 | 73 | 206 | 217
Engineered Products and Forgings | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 1,794 | 1,683 | 5,372 | 5,083
Engineered Products and Forgings | Intersegment sales |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 0 | 0 | 0 | 0
Engineered Products and Forgings | Third-party sales | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 1,794 | 1,683 | 5,372 | 5,083
Global Rolled Products |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment operating profit | 161 | 107 | 475 | 388
Restructuring and other charges | 62 | 2 | 99 | 3
Provision for depreciation and amortization | 57 | 61 | 175 | 185
Global Rolled Products | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 1,804 | 1,883 | 5,557 | 5,629
Global Rolled Products | Intersegment sales |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 41 | 44 | 142 | 161
Global Rolled Products | Third-party sales | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | $ 1,763 | $ 1,839 | $ 5,415 | $ 5,468

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