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Restructuring and Other Charges - Additional Information (Detail)		3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017 Employees	Jun. 30, 2017 USD ($) Employees Positions	Jun. 30, 2016 USD ($) Positions	Jun. 30, 2017 USD ($) Employees Positions	Jun. 30, 2016 USD ($) Positions	Dec. 31, 2016 USD ($) Employees
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges		$ 26,000,000	$ 14,000,000	$ 99,000,000	$ 30,000,000
Restructuring and other charges after tax and noncontrolling interest		$ 17,000,000	$ 9,000,000	$ 86,000,000	$ 20,000,000
Number of employees associated with layoff costs | Positions		352	540	680	1,070
Reversal of forfeited executive stock compensation		$ 13,000,000		$ 13,000,000
Severance charges		7,000,000		7,000,000
Cash payments made against the layoff reserves				31,000,000		$ 86,000,000
Minimum amount of cash payments expected to be paid beyond the end of the current annual period				10,000,000
Maximum amount of cash payments expected to be paid beyond the end of the current annual period				12,000,000
Corporate [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges		$ (5,000,000)	$ (3,000,000)	$ 2,000,000	$ 3,000,000
Number of employees associated with layoff costs | Positions		20		62
Engineered Products and Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Number of employees associated with layoff costs | Positions		129	300	243	800
Global Rolled Products [Member]
Restructuring Cost and Reserve [Line Items]
Number of employees associated with layoff costs | Positions		110		242	30
Transportation and Construction Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Number of employees associated with layoff costs | Positions		93	240	133	240
Fusina Italy [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges				$ 60,000,000
Restructuring and other charges after tax and noncontrolling interest				60,000,000
Restructuring Programs Layoffs 2015 [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges		$ 29,000,000	$ 13,000,000	48,000,000	$ 30,000,000
Restructuring and other charges after tax and noncontrolling interest		$ 19,000,000	8,000,000	$ 32,000,000	19,000,000
Number of employees associated with layoff costs | Employees				1,220		1,240
Approximate number of employees already laid off | Employees	1,120	1,120		1,120
Cash payments made against the layoff reserves		$ 1,000,000		$ 4,000,000
Other Miscellaneous Items [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges		4,000,000	7,000,000	1,000,000	7,000,000
Restructuring and other charges after tax and noncontrolling interest		3,000,000	4,000,000	0	4,000,000
Other Adjustments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges		1,000,000	6,000,000	2,000,000	7,000,000
Restructuring and other charges after tax and noncontrolling interest		$ 1,000,000	$ 3,000,000	$ 2,000,000	$ 3,000,000
Restructuring Programs Layoffs 2017 [Member]
Restructuring Cost and Reserve [Line Items]
Number of employees associated with layoff costs | Employees	680
Approximate number of employees already laid off | Employees	65	65		65
Cash payments made against the layoff reserves		$ 1,000,000		$ 2,000,000
Restructuring Programs Layoffs 2016 [Member]
Restructuring Cost and Reserve [Line Items]
Number of employees associated with layoff costs | Employees	1,770					1,800
Approximate number of employees already laid off | Employees	1,170	1,170		1,170
Cash payments made against the layoff reserves		$ 6,000,000		$ 20,000,000
Reversal of Forfeited Executive Stock Compensation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges		6,000,000		6,000,000
Restructuring and other charges after tax and noncontrolling interest		$ 4,000,000		$ 4,000,000

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- Definition

The maximum amount of cash payments expected to be paid beyond the end of the current annual period related to restructuring charges such as ongoing site remediation work, special termination benefit payments, least termination costs, among others.

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Amount charged against earnings in the period after-tax and noncontrolling interests for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a program that is planned and controlled by management, and materially changes either the scope of a business undertaken by an entity, or the manner in which that business is conducted.

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Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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