Goodwill and Other Intangible Assets (Tables)

6 Months Ended

Mar. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in Carrying Amount of Goodwill

The changes in the carrying amount of goodwill in each of the Company’s reportable segments for the six month period ended March 31, 2018 were as follows (in millions):

			Business Acquisitions		Business Divestitures			Currency Translation and Other
	September 30,										March 31,
	2017										2018
Building Technologies & Solutions
Building Solutions North America	$	9,637	$	—	$	—		$	(22	)	$	9,615
Building Solutions EMEA/LA	2,012		—		—			77			2,089
Building Solutions Asia Pacific	1,255		—		—			54			1,309
Global Products	5,687		8		(20		)	2			5,677
Power Solutions	1,097		—		—			19			1,116
Total	$	19,688	$	8	$	(20	)	$	130		$	19,806

Other Intangible Assets

The Company’s other intangible assets, primarily from business acquisitions valued based on independent appraisals, consisted of (in millions):

	March 31, 2018							September 30, 2017
	Gross Carrying Amount		Accumulated Amortization			Net		Gross Carrying Amount		Accumulated Amortization			Net
Amortized intangible assets
Technology	$	1,344	$	(205	)	$	1,139	$	1,328	$	(137	)	$	1,191
Customer relationships	3,163		(561		)	2,602		3,168		(486		)	2,682
Miscellaneous	443		(176		)	267		389		(147		)	242
Total amortized intangible assets	4,950		(942		)	4,008		4,885		(770		)	4,115
Unamortized intangible assets
Trademarks/trade names	2,494		—			2,494		2,483		—			2,483
Miscellaneous	123		—			123		143		—			143
	2,617		—			2,617		2,626		—			2,626
Total intangible assets	$	7,567	$	(942	)	$	6,625	$	7,511	$	(770	)	$	6,741