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Long-Lived Assets - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Property, Plant and Equipment [Line Items] |  |
Less: accumulated depreciation and amortization | $ 7,070 | $ 6,769
Properties, plants and equipment excluding construction work in progress | 4,636 | 4,965
Construction work-in-progress | 741 | 739
Properties, plants, and equipment, net | 5,377 | 5,704
Land and land rights |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 133 | 136
Structures |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 2,349 | 2,364
Machinery and equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 9,224 | 9,234
Depreciable property, plant and equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 11,706 | $ 11,734
Arconic Engines |  |
Property, Plant and Equipment [Line Items] |  |
Asset impairment charges | 428 |
Property, Plant and Equipment | Arconic Engines |  |
Property, Plant and Equipment [Line Items] |  |
Asset impairment charges | 198 |
Indefinite-lived Intangible Assets |  |
Property, Plant and Equipment [Line Items] |  |
Asset impairment charges | 197 |
Other Noncurrent Assets | Arconic Engines |  |
Property, Plant and Equipment [Line Items] |  |
Asset impairment charges | $ 33 |

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