Restructuring and Other Charges - Schedule of Restructuring and Other Charges by Reportable Segments, Pretax (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	$ 685	$ 155	$ 214	$ 314
Operating Segments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges		132	175	290
Corporate [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges		23	39	24
Global Rolled Products [Member] | Operating Segments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges		40	121	267
Engineered Products and Solutions [Member] | Operating Segments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges		78	46	13
Transportation and Construction Solutions [Member] | Operating Segments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges		$ 14	$ 8	$ 10