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Revenue from Contracts with Customers - Segment Revenue By Product (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customers | $ 3,522 | $ 3,234 | $ 10,575 | $ 9,685
Aerospace |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customers | 1,464 | 1,344 | 4,320 | 4,096
Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customers | 972 | 802 | 2,894 | 2,333
Building and construction |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customers | 352 | 342 | 1,042 | 987
Industrial and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customers | 734 | 746 | 2,319 | 2,269
Engineered Products and Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customers | 1,566 | 1,477 | 4,703 | 4,449
Engineered Products and Solutions | Aerospace |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customers | 1,244 | 1,130 | 3,675 | 3,426
Engineered Products and Solutions | Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customers | 110 | 98 | 326 | 288
Engineered Products and Solutions | Building and construction |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customers | 0 | 0 | 0 | 0
Engineered Products and Solutions | Industrial and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customers | 212 | 249 | 702 | 735
Global Rolled Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customers | 1,426 | 1,234 | 4,243 | 3,753
Global Rolled Products | Aerospace |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customers | 220 | 214 | 645 | 670
Global Rolled Products | Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customers | 625 | 490 | 1,835 | 1,458
Global Rolled Products | Building and construction |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customers | 59 | 56 | 167 | 156
Global Rolled Products | Industrial and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customers | 522 | 474 | 1,596 | 1,469
Transportation and Construction Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customers | 530 | 523 | 1,629 | 1,483
Transportation and Construction Solutions | Aerospace |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customers | 0 | 0 | 0 | 0
Transportation and Construction Solutions | Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customers | 237 | 214 | 733 | 587
Transportation and Construction Solutions | Building and construction |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customers | 293 | 286 | 875 | 831
Transportation and Construction Solutions | Industrial and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customers | $ 0 | $ 23 | $ 21 | $ 65

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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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