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Segment Information - Disaggregation of Revenue by Major End Market Served (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | $ 3,557 | $ 3,522 | $ 10,787 | $ 10,551
Engineered Products and Forgings |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 1,794 | 1,683 | 5,372 | 5,083
Global Rolled Products |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 1,763 | 1,839 | 5,415 | 5,468
Aerospace |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 1,590 | 1,464 | 4,754 | 4,321
Aerospace | Engineered Products and Forgings |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 1,290 | 1,190 | 3,823 | 3,519
Aerospace | Global Rolled Products |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 300 | 274 | 931 | 802
Transportation |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 906 | 973 | 2,872 | 2,895
Transportation | Engineered Products and Forgings |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 319 | 319 | 1,004 | 981
Transportation | Global Rolled Products |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 587 | 654 | 1,868 | 1,914
Building and construction |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 329 | 352 | 1,004 | 1,033
Building and construction | Engineered Products and Forgings |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Building and construction | Global Rolled Products |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 329 | 352 | 1,004 | 1,033
Industrial and Other |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 732 | 733 | 2,157 | 2,302
Industrial and Other | Engineered Products and Forgings |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 185 | 174 | 545 | 583
Industrial and Other | Global Rolled Products |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | $ 547 | $ 559 | $ 1,612 | $ 1,719

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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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