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Segment Information - Disaggregation of Revenue by Major End Market Served (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Revenue, Major Customer [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 3,209 | $ 3,541
Operating Segments |  |
Revenue, Major Customer [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 3,209 | 3,540
Engineered Products and Forgings |  |
Revenue, Major Customer [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 1,631 | 1,756
Global Rolled Products |  |
Revenue, Major Customer [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 1,578 | 1,784
Global Rolled Products | Operating Segments |  |
Revenue, Major Customer [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 1,578 | 1,784
Aerospace | Operating Segments |  |
Revenue, Major Customer [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 1,474 | 1,552
Aerospace | Engineered Products and Forgings |  |
Revenue, Major Customer [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 1,189 | 1,250
Aerospace | Global Rolled Products |  |
Revenue, Major Customer [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 285 | 302
Transportation | Operating Segments |  |
Revenue, Major Customer [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 765 | 992
Transportation | Engineered Products and Forgings |  |
Revenue, Major Customer [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 256 | 343
Transportation | Global Rolled Products |  |
Revenue, Major Customer [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 509 | 649
Building and construction | Operating Segments |  |
Revenue, Major Customer [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 291 | 330
Building and construction | Engineered Products and Forgings |  |
Revenue, Major Customer [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0
Building and construction | Global Rolled Products |  |
Revenue, Major Customer [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 291 | 330
Industrial and Other | Operating Segments |  |
Revenue, Major Customer [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 679 | 666
Industrial and Other | Engineered Products and Forgings |  |
Revenue, Major Customer [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 186 | 163
Industrial and Other | Global Rolled Products |  |
Revenue, Major Customer [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 493 | $ 503

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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