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Properties, Plants, and Equipment, Net (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Property, Plant and Equipment [Line Items] |  |  |
Properties, plants, and equipment, gross |  | $ 11,734,000,000 | $ 11,365,000,000
Less: accumulated depreciation and amortization |  | 6,769,000,000 | 6,392,000,000
Properties plants and equipment excluding construction work in progress |  | 4,965,000,000 | 4,973,000,000
Construction work-in-progress |  | 739,000,000 | 621,000,000
Properties, plants, and equipment, net |  | 5,704,000,000 | 5,594,000,000
Land and land rights |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Properties, plants, and equipment, gross |  | 136,000,000 | 140,000,000
Structures |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Properties, plants, and equipment, gross |  | 2,364,000,000 | 2,395,000,000
Machinery and equipment: |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Properties, plants, and equipment, gross |  | 9,234,000,000 | 8,830,000,000
Arconic Engines |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Assets | $ 515,000,000 |  |
Percentage of fair value in excess of carrying amount | 13.00% |  |
Asset impairment charges | $ 0 |  |
Effect of one percentage point decrease on undiscounted cash flows |  | 6,000,000 |
Total segment sales | Structures | Engineered Products and Solutions |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Properties, plants, and equipment, gross |  | 796,000,000 | 784,000,000
Total segment sales | Structures | Global Rolled Products |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Properties, plants, and equipment, gross |  | 1,068,000,000 | 1,090,000,000
Total segment sales | Structures | Transportation and Construction Solutions |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Properties, plants, and equipment, gross |  | 248,000,000 | 268,000,000
Total segment sales | Machinery and equipment: | Engineered Products and Solutions |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Properties, plants, and equipment, gross |  | 3,437,000,000 | 3,054,000,000
Total segment sales | Machinery and equipment: | Global Rolled Products |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Properties, plants, and equipment, gross |  | 4,629,000,000 | 4,641,000,000
Total segment sales | Machinery and equipment: | Transportation and Construction Solutions |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Properties, plants, and equipment, gross |  | 748,000,000 | 777,000,000
Other |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Properties, plants, and equipment, net |  | 305,000,000 | 310,000,000
Other | Structures |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Properties, plants, and equipment, gross |  | 252,000,000 | 253,000,000
Other | Machinery and equipment: |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Properties, plants, and equipment, gross |  | $ 420,000,000 | $ 358,000,000

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