Restructuring Charges - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 116	$ 211	$ 129
Severance costs	57	177	112
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	57	177
Hydraulics [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	32	67	31
Aerospace [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2	4	5
Vehicle [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	12	35	34
Corporate, Non-Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 25	$ 12	$ 18