Restructuring and Other Charges - Schedule of Restructuring and Other Charges by Reportable Segments, Pretax (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	$ 19	$ 3	$ 118	$ 33
Operating Segments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	14	(4)	111	23
Corporate [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	5	7	7	10
Engineered Products and Solutions [Member] | Operating Segments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	10	(1)	24	16
Global Rolled Products [Member] | Operating Segments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	2	(1)	76	1
Transportation and Construction Solutions [Member] | Operating Segments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	$ 2	$ (2)	$ 11	$ 6