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Acquisitions and Divestitures - 2018 Divestitures (Details) $ in Millions |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) employee | Oct. 31, 2018 USD ($) | Apr. 02, 2018 USD ($) employee | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Restructuring and other charges |  |  |  |  |  |  | $ 620 | $ 9 | $ 165
Gain (loss) on disposition of business |  |  |  |  |  |  | 20 | 109 | (57)
Latin America Extrusions (LAE) |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Balance sheet adjustment | $ 2 |  |  |  | $ 2 |  |  | 2 |
Number of employees | employee |  |  | 612 |  |  |  |  |  |
Consideration |  |  | $ 2 |  |  |  |  |  |
Texarkana, Texas Rolling Mill And Cast House |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Period of operationalizing rolling mill equipment of transaction closing date |  | 36 months |  |  |  |  |  |  |
Minimum required terms of leases on cast house building and equipment |  | 18 months |  |  |  |  |  |  |
Period of supply with aluminum |  | 24 months |  |  |  |  |  |  |
Gain (loss) on disposition of business |  | $ 154 |  | $ 20 |  |  |  |  |
Contingent consideration | 5 |  |  | $ 25 | 5 |  | 25 | 5 |
Deferred gain on sale of property | $ 95 |  |  |  | 95 |  |  | 95 |
Eger |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of employees | employee | 180 |  |  |  |  |  |  |  |
Consideration | $ 2 |  |  |  | 2 |  |  | 2 |
Gain (loss) on disposition of business |  |  |  |  | $ (43) |  | (43) | (43) |
Disposed of by Sale | Texarkana, Texas Rolling Mill And Cast House |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from divestiture of businesses |  | 63 |  |  |  |  |  |  |
Consideration |  | 302 |  |  |  |  |  |  |
Additional contingent consideration |  | $ 50 |  |  |  |  |  |  |
Divested Businesses | Disposed of by Sale | Latin America Extrusions (LAE) |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Restructuring and other charges |  |  |  |  |  | $ 41 |  |  |
Transportation and Construction Solutions | Latin America Extrusions (LAE) |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  | 25 | $ 115
Engineered Products and Forgings | Eger |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  | $ 32 | 38 |
Ta Chen International, Inc. | Texarkana, Texas Rolling Mill And Cast House |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Period of services performed, processing of metal |  | 6 months |  |  |  |  |  |  |
Accounting Standards Update 2016-02 | Property, Plant and Equipment |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax |  |  |  |  |  |  |  | (24) |
Accounting Standards Update 2016-02 | Other Noncurrent Liabilities and Deferred Credits |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax |  |  |  |  |  |  |  | 119 |
Accounting Standards Update 2016-02 | Other Noncurrent Assets] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax |  |  |  |  |  |  |  | $ (22) |

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