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Revenue from Contracts with Customers (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Costs related to settlements of certain customer claims |  |  |  |  |  |  |  |  | $ 38 |  |
Sales (B and C) | $ 3,472 | $ 3,524 | $ 3,573 | $ 3,445 | $ 3,271 | $ 3,236 | $ 3,261 | $ 3,192 | 14,014 | $ 12,960 | $ 12,394
Engineered Products and Solutions |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B and C) |  |  |  |  |  |  |  |  | 6,316 | 5,943 | 5,728
Engineered Products and Solutions | Aerospace |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B and C) |  |  |  |  |  |  |  |  | 4,947 | 4,572 | 4,358
Engineered Products and Solutions | Transportation |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B and C) |  |  |  |  |  |  |  |  | 440 | 383 | 347
Engineered Products and Solutions | Building and construction |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B and C) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Engineered Products and Solutions | Industrial and Other |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B and C) |  |  |  |  |  |  |  |  | 929 | 988 | 1,023
Global Rolled Products |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B and C) |  |  |  |  |  |  |  |  | 5,604 | 5,000 | 4,865
Global Rolled Products | Aerospace |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B and C) |  |  |  |  |  |  |  |  | 891 | 883 | 942
Global Rolled Products | Transportation |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B and C) |  |  |  |  |  |  |  |  | 2,443 | 1,981 | 1,577
Global Rolled Products | Building and construction |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B and C) |  |  |  |  |  |  |  |  | 217 | 204 | 200
Global Rolled Products | Industrial and Other |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B and C) |  |  |  |  |  |  |  |  | 2,053 | 1,932 | 2,146
Transportation and Construction Solutions |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B and C) |  |  |  |  |  |  |  |  | 2,126 | 2,011 | 1,802
Transportation and Construction Solutions | Aerospace |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B and C) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Transportation and Construction Solutions | Transportation |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B and C) |  |  |  |  |  |  |  |  | 969 | 805 | 708
Transportation and Construction Solutions | Building and construction |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B and C) |  |  |  |  |  |  |  |  | 1,150 | 1,113 | 1,060
Transportation and Construction Solutions | Industrial and Other |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B and C) |  |  |  |  |  |  |  |  | 7 | 93 | 34
Total Segment |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B and C) |  |  |  |  |  |  |  |  | 14,206 | 13,102 | 12,513
Total Segment | Aerospace |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B and C) |  |  |  |  |  |  |  |  | 5,838 | 5,455 | 5,300
Total Segment | Transportation |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B and C) |  |  |  |  |  |  |  |  | 3,852 | 3,169 | 2,632
Total Segment | Building and construction |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B and C) |  |  |  |  |  |  |  |  | 1,367 | 1,317 | 1,260
Total Segment | Industrial and Other |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B and C) |  |  |  |  |  |  |  |  | 2,989 | 3,013 | 3,203
Total Segment | Engineered Products and Solutions |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B and C) |  |  |  |  |  |  |  |  | 6,316 | 5,943 | 5,728
Total Segment | Global Rolled Products |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B and C) |  |  |  |  |  |  |  |  | 5,764 | 5,148 | 4,983
Total Segment | Transportation and Construction Solutions |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B and C) |  |  |  |  |  |  |  |  | 2,126 | 2,011 | 1,802
Third-Party Sales | Total Segment |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B and C) |  |  |  |  |  |  |  |  | 14,046 | 12,954 | 12,395
Third-Party Sales | Total Segment | Engineered Products and Solutions |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B and C) |  |  |  |  |  |  |  |  | 6,316 | 5,943 | 5,728
Third-Party Sales | Total Segment | Global Rolled Products |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B and C) |  |  |  |  |  |  |  |  | 5,604 | 5,000 | 4,865
Third-Party Sales | Total Segment | Transportation and Construction Solutions |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales (B and C) |  |  |  |  |  |  |  |  | $ 2,126 | $ 2,011 | $ 1,802

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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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