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Segment Information - Disaggregation of Revenue by Major End Market Served (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Revenue, Major Customer [Line Items] |  |
Revenues | $ 3,540 | $ 3,444
Engineered Products and Solutions |  |
Revenue, Major Customer [Line Items] |  |
Revenues | 1,502 | 1,426
Global Rolled Products |  |
Revenue, Major Customer [Line Items] |  |
Revenues | 1,503 | 1,481
Transportation and Construction Solutions |  |
Revenue, Major Customer [Line Items] |  |
Revenues | 535 | 537
Aerospace |  |
Revenue, Major Customer [Line Items] |  |
Revenues | 1,552 | 1,389
Aerospace | Engineered Products and Solutions |  |
Revenue, Major Customer [Line Items] |  |
Revenues | 1,250 | 1,141
Aerospace | Global Rolled Products |  |
Revenue, Major Customer [Line Items] |  |
Revenues | 302 | 248
Aerospace | Transportation and Construction Solutions |  |
Revenue, Major Customer [Line Items] |  |
Revenues | 0 | 0
Transportation |  |
Revenue, Major Customer [Line Items] |  |
Revenues | 991 | 938
Transportation | Engineered Products and Solutions |  |
Revenue, Major Customer [Line Items] |  |
Revenues | 87 | 73
Transportation | Global Rolled Products |  |
Revenue, Major Customer [Line Items] |  |
Revenues | 649 | 622
Transportation | Transportation and Construction Solutions |  |
Revenue, Major Customer [Line Items] |  |
Revenues | 255 | 243
Building and construction |  |
Revenue, Major Customer [Line Items] |  |
Revenues | 330 | 333
Building and construction | Engineered Products and Solutions |  |
Revenue, Major Customer [Line Items] |  |
Revenues | 0 | 0
Building and construction | Global Rolled Products |  |
Revenue, Major Customer [Line Items] |  |
Revenues | 49 | 48
Building and construction | Transportation and Construction Solutions |  |
Revenue, Major Customer [Line Items] |  |
Revenues | 281 | 285
Industrial and Other |  |
Revenue, Major Customer [Line Items] |  |
Revenues | 667 | 784
Industrial and Other | Engineered Products and Solutions |  |
Revenue, Major Customer [Line Items] |  |
Revenues | 165 | 212
Industrial and Other | Global Rolled Products |  |
Revenue, Major Customer [Line Items] |  |
Revenues | 503 | 563
Industrial and Other | Transportation and Construction Solutions |  |
Revenue, Major Customer [Line Items] |  |
Revenues | $ (1) | $ 9

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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