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Property, Plants, and Equipment, Net (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Property, Plant and Equipment [Line Items] |  |
Less: accumulated depreciation and amortization | $ 6,778 | $ 6,392
Properties, plants, and equipment, net | 5,645 | 5,594
Undiscounted cash flows, effect of one percentage point decrease on net cash flows | $ 6 |
Disks Business |  |
Property, Plant and Equipment [Line Items] |  |
Estimated undiscounted cash flows in excess its carrying value, percent | 13.00% |
Arconic Engines |  |
Property, Plant and Equipment [Line Items] |  |
Long-lived assets | $ 515 |
Land and land rights |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 138 | 140
Structures |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 2,374 | 2,395
Machinery and equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 9,244 | 8,830
Depreciable property, plant and equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 11,756 | 11,365
Properties, plants, and equipment, net | 4,978 | 4,973
Construction work-in-progress |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | $ 667 | $ 621

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