Restructuring and Other Charges - Schedule of Restructuring and Other Charges by Reportable Segments, Pretax (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	$ 165	$ 155	$ 214
Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	154	132	175
Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	11	23	39
Engineered Products and Solutions | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	30	78	46
Global Rolled Products | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	72	40	121
Transportation and Construction Solutions | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	$ 52	$ 14	$ 8