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Revenue from Contracts with Customers - Segment Revenue By Product (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customers | $ 3,444 | $ 3,191
Aerospace |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customers | 1,389 | 1,370
Transportation |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customers | 938 | 759
Building and construction |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customers | 333 | 311
Industrial and other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customers | 784 | 751
Engineered Products and Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customers | 1,541 | 1,487
Engineered Products and Solutions | Aerospace |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customers | 1,190 | 1,155
Engineered Products and Solutions | Transportation |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customers | 97 | 93
Engineered Products and Solutions | Building and construction |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customers | 0 | 0
Engineered Products and Solutions | Industrial and other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customers | 254 | 239
Global Rolled Products |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customers | 1,366 | 1,248
Global Rolled Products | Aerospace |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customers | 199 | 215
Global Rolled Products | Transportation |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customers | 598 | 493
Global Rolled Products | Building and construction |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customers | 48 | 49
Global Rolled Products | Industrial and other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customers | 521 | 491
Transportation and Construction Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customers | 537 | 456
Transportation and Construction Solutions | Aerospace |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customers | 0 | 0
Transportation and Construction Solutions | Transportation |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customers | 243 | 173
Transportation and Construction Solutions | Building and construction |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customers | 285 | 262
Transportation and Construction Solutions | Industrial and other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customers | $ 9 | $ 21

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 32 -Paragraph 2A -URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045 + Details
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