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Acquisitions and Divestitures - Additional Information (Detail) $ / shares in Units, € in Millions, $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Nov. 30, 2014 USD ($) | Mar. 31, 2015 EUR (€) Employees | Mar. 31, 2015 USD ($) Employees $ / shares shares | Mar. 31, 2015 USD ($) $ / shares Series shares | Jun. 30, 2015 USD ($) | Dec. 31, 2014 USD ($) Employees | Mar. 06, 2015 $ / shares
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 5,232 | $ 5,247 |
Russia [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Net cash received |  |  |  |  | 30 |  |
Loss from divestitures before income tax |  |  |  |  | 159 |  |
Net loss, after tax and noncontrolling interest |  |  |  |  | 149 |  |
Stupino Titanium Company [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of employees | Employees |  | 1,870 | 1,870 |  |  |  |
Generated sale,net |  |  | $ 130 |  |  |  |
Tital [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  |  | $ 123 | $ 123 |  |  |
Number of employees | Employees |  | 650 | 650 |  |  |  |
Cash paid for business acquisition |  | € 188 | $ 204 |  |  |  |
RTI [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of employees | Employees |  |  |  |  |  | 2,600 |
Common stock estimated value |  |  | $ 1,100 | $ 1,100 |  |  |
Business acquisition common stock issued, price per share | $ / shares |  |  | $ 12.92 | $ 12.92 |  |  | $ 14.48
Number of shares to be issued upon conversion | $ / shares |  |  | $ 2.8315 | $ 2.8315 |  |  |
Acquisition price per share | $ / shares |  |  |  |  |  |  | $ 41
Common stock outstanding | shares |  |  | 30,794,405 | 30,794,405 |  |  |
Assumed debt |  |  | $ 500 | $ 500 |  |  |
Business acquisition cash assumed |  |  | 300 | 300 |  |  |
Generated sale,net |  |  |  |  |  | $ 794 |
RTI [Member] | Senior Notes [Member] | Convertible Debt [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Assumed debt |  |  | $ 500 | $ 500 |  |  |
Number of additional series | Series |  |  |  | 2 |  |  |
Conversion of convertible senior notes to common stock | shares |  |  |  | (13,070,774) |  |  |
Firth Rixson [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business acquisition purchase price | $ 2,995 |  |  |  |  |  |
Contingent consideration | 130 |  |  |  |  |  |
Total assets | 3,470 |  |  |  |  |  |
Goodwill | 1,898 |  |  |  |  |  |
Intangible assets | 398 |  |  |  | 794 |  |
Total liabilities | $ 475 |  |  |  |  |  |
Properties, plants and equipment |  |  |  |  | 165 |  |
Decrease in goodwill |  |  |  |  | 396 |  |
Firth Rixson [Member] | Goodwill [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Decrease in goodwill |  |  |  |  | $ (116) |  |

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