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Segment Information - Disaggregation of Revenue by Major End Market Served (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | $ 3,690 | $ 3,609 | $ 7,230 | $ 7,053
Engineered Products and Solutions |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 1,565 | 1,474 | 3,067 | 2,900
Global Rolled Products |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 1,577 | 1,573 | 3,080 | 3,054
Transportation and Construction Solutions |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 548 | 562 | 1,083 | 1,099
Aerospace |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 1,611 | 1,467 | 3,163 | 2,856
Aerospace | Engineered Products and Solutions |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 1,283 | 1,187 | 2,533 | 2,328
Aerospace | Global Rolled Products |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 328 | 280 | 630 | 528
Aerospace | Transportation and Construction Solutions |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Transportation |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 975 | 984 | 1,966 | 1,922
Transportation | Engineered Products and Solutions |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 85 | 93 | 172 | 166
Transportation | Global Rolled Products |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 632 | 638 | 1,281 | 1,260
Transportation | Transportation and Construction Solutions |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 258 | 253 | 513 | 496
Building and construction |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 345 | 357 | 675 | 690
Building and construction | Engineered Products and Solutions |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Building and construction | Global Rolled Products |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 54 | 60 | 103 | 108
Building and construction | Transportation and Construction Solutions |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 291 | 297 | 572 | 582
Industrial and Other |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 759 | 801 | 1,426 | 1,585
Industrial and Other | Engineered Products and Solutions |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 197 | 194 | 362 | 406
Industrial and Other | Global Rolled Products |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 563 | 595 | 1,066 | 1,158
Industrial and Other | Transportation and Construction Solutions |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | $ (1) | $ 12 | $ (2) | $ 21

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