Significant Restructuring Costs - Additional Information (Detail) $ in Millions	3 Months Ended					9 Months Ended		30 Months Ended
	Jun. 30, 2018 USD ($) Employees Plant	Dec. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jun. 30, 2018 USD ($) Employees Plant	Jun. 30, 2017 USD ($)	Mar. 31, 2018 Employees Plant
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs | $	$ 0	$ 158	$ 49	$ 99	$ 78	$ 158	$ 226
Number of employees to be severed								9,200
Number of employees severed	4,300					4,300
Number of plants to be closed | Plant								11
Plants closed | Plant	6					6
Building Technologies & Solutions
Restructuring Cost and Reserve [Line Items]
Number of employees to be severed								7,300
Number of plants to be closed | Plant								11
Corporate Segment
Restructuring Cost and Reserve [Line Items]
Number of employees to be severed								1,700
Power Solutions
Restructuring Cost and Reserve [Line Items]
Number of employees to be severed								200