Acquisitions and Divestitures - Additional Information (Detail) In Millions, except Share data, unless otherwise specified			3 Months Ended		0 Months Ended	3 Months Ended		3 Months Ended			12 Months Ended			3 Months Ended
	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Mar. 31, 2015 Stupino Titanium Company [Member] USD ($) Employees	Mar. 31, 2015 Russia [Member] USD ($)	Nov. 30, 2014 Firth Rixson [Member] USD ($)	Mar. 31, 2015 Firth Rixson [Member] USD ($)	Nov. 30, 2014 Firth Rixson [Member] USD ($)	Mar. 31, 2015 Firth Rixson [Member] Goodwill [Member] USD ($)	Mar. 31, 2015 Tital [Member] USD ($) Employees	Mar. 31, 2015 Tital [Member] EUR (€)	Dec. 31, 2014 RTI [Member] USD ($) Employees	Mar. 31, 2015 RTI [Member] USD ($)	Mar. 06, 2015 RTI [Member] USD ($)	Mar. 31, 2015 RTI [Member] Senior Notes [Member] Convertible Debt [Member] USD ($) Series
Business Acquisition [Line Items]
Business acquisition purchase price					$ 2,995
Contingent consideration							130
Total assets							3,470
Goodwill	5,050	5,247					1,898		123
Intangible assets						968	398
Total liabilities							475
Properties, plants and equipment						135
Decrease in goodwill						570		(275)
Number of employees			1,870						650	650	2,600
Cash paid for business acquisition									204	188
Common stock estimated value	1,304	1,304										1,100
Business acquisition common stock issued, price per share												$ 12.92	$ 14.48
Number of shares to be issued upon conversion												$ 2.8315
Acquisition price per share													$ 41
Common stock outstanding												30,794,405
Assumed debt												500		500
Business acquisition cash assumed												300
Number of additional series														2
Conversion of convertible senior notes to common stock														(13,070,774)
Generated sale,net			130								794
Net cash payment				8
Loss from divestitures before income tax				149
Net loss, after tax and noncontrolling interest				$ 142