Restructuring and Other Charges - Additional Information (Detail)		3 Months Ended		12 Months Ended
	Mar. 31, 2017 Employees	Mar. 31, 2017 USD ($) Employees Positions	Mar. 31, 2016 USD ($) Positions	Dec. 31, 2016 Employees
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges		$ 73,000,000	$ 16,000,000
Restructuring and other charges after tax and noncontrolling interest		$ 69,000,000
Number of employees associated with layoff costs | Positions		328
Restructuring and other charges after tax			11,000,000
Minimum amount of cash payments expected to be paid beyond the end of the current annual period		$ 1,000,000
Maximum amount of cash payments expected to be paid beyond the end of the current annual period		5,000,000
Corporate [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges		$ 7,000,000	6,000,000
Number of employees associated with layoff costs | Positions		42
Engineered Products and Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Number of employees associated with layoff costs | Positions		114
Global Rolled Products [Member]
Restructuring Cost and Reserve [Line Items]
Number of employees associated with layoff costs | Positions		132
Transportation and Construction Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Number of employees associated with layoff costs | Positions		40
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		19,000,000	$ 17,000,000
Restructuring and other charges after tax and noncontrolling interest		$ 13,000,000
Number of employees associated with layoff costs		1,220	530	1,240
Restructuring and other charges after tax			$ 11,000,000
Approximate number of employees already laid off | Employees	1,120	1,120
Cash payments made against the layoff reserves		$ 3,000,000
Restructuring Programs Layoffs 2015 [Member] | Engineered Products and Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Number of employees associated with layoff costs | Positions			500
Restructuring Programs Layoffs 2015 [Member] | Global Rolled Products [Member]
Restructuring Cost and Reserve [Line Items]
Number of employees associated with layoff costs | Positions			30
Other Miscellaneous Items [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges		5,000,000
Restructuring and other charges after tax and noncontrolling interest		3,000,000
Other Adjustments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges		1,000,000	$ 1,000,000
Restructuring and other charges after tax and noncontrolling interest		$ 1,000,000	$ 0
Restructuring Programs Layoffs 2017 [Member]
Restructuring Cost and Reserve [Line Items]
Number of employees associated with layoff costs | Employees	328
Approximate number of employees already laid off | Employees	5	5
Cash payments made against the layoff reserves		$ 1,000,000
Restructuring Programs Layoffs 2016 [Member]
Restructuring Cost and Reserve [Line Items]
Number of employees associated with layoff costs | Employees	1,800
Approximate number of employees already laid off | Employees	1,075	1,075
Cash payments made against the layoff reserves		$ 14,000,000