Business, Product and Geographical Area Information and Concentration of Risk - Schedule of Export Sales and Primary Aluminum Supply from Major Suppliers (Details)	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Export Sales \| Geographic Concentration Risk \| Supplier
Concentration Risk [Line Items]
Concentration risk, percentage	10.00%	10.00%	14.00%
Aluminum \| Supplier Concentration Risk \| Top Five Major Suppliers
Concentration Risk [Line Items]
Concentration risk, percentage	78.00%	72.00%	74.00%
Aluminum \| Supplier Concentration Risk \| Largest Supplier
Concentration Risk [Line Items]
Concentration risk, percentage	47.00%	21.00%	22.00%
Aluminum \| Supplier Concentration Risk \| Second and Third Largest Suppliers
Concentration Risk [Line Items]
Concentration risk, percentage	20.00%	32.00%	32.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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