Restructuring and Other Charges - Schedule of Restructuring and Other Charges by Reportable Segments, Pretax (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	$ 26	$ 14	$ 99	$ 30
Operating Segments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	31	17	97	27
Corporate [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	(5)	(3)	2	3
Engineered Products and Solutions [Member] | Operating Segments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	8	9	14	17
Global Rolled Products [Member] | Operating Segments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	17		74	2
Transportation and Construction Solutions [Member] | Operating Segments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	$ 6	$ 8	$ 9	$ 8