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Segment and Geographic Area Information - Sales by Major Product Grouping (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Product Information [Line Items] |  |  |
Sales | $ 14,014 | $ 12,960 | $ 12,394
Innovative flat-rolled products |  |  |
Product Information [Line Items] |  |  |
Sales | 5,588 | 4,992 | 4,864
Engines |  |  |
Product Information [Line Items] |  |  |
Sales | 2,940 | 2,708 | 2,560
Engineered structures |  |  |
Product Information [Line Items] |  |  |
Sales | 1,839 | 1,743 | 1,683
Fastening systems |  |  |
Product Information [Line Items] |  |  |
Sales | 1,531 | 1,484 | 1,463
Architectural aluminum systems |  |  |
Product Information [Line Items] |  |  |
Sales | 1,140 | 1,065 | 1,010
Aluminum wheels |  |  |
Product Information [Line Items] |  |  |
Sales | 969 | 805 | 689
Other |  |  |
Product Information [Line Items] |  |  |
Sales | $ 7 | $ 163 | $ 125

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