Restructuring and Other Charges - Schedule of Restructuring and Other Charges by Reportable Segments, Pretax (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	$ 73	$ 16
Operating Segments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	66	10
Corporate [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	7	6
Engineered Products and Solutions [Member] | Operating Segments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	6	8
Global Rolled Products [Member] | Operating Segments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	57	$ 2
Transportation and Construction Solutions [Member] | Operating Segments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	$ 3