Goodwill and Other Identifiable Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Carrying Amount of Goodwill Attributable to Each Reportable Segment

The change in the carrying amount of goodwill attributable to each reportable business segment for the years ended December 31, 2016 and 2015 was as follows:

($ in millions)	Performance Coatings			Industrial Coatings			Glass			Total
Balance, January 1, 2015	$	3,267		$	486		$	48		$	3,801
Acquisitions	109			104			—			213
Foreign currency translation	(303		)	(38		)	(4		)	(345		)
Balance, December 31, 2015	$	3,073		$	552		$	44		$	3,669
Acquisitions	6			168			—			174
Divestitures	—			—			(44		)	(44		)
Foreign currency translation	(209		)	(18		)	—			(227		)
Balance, December 31, 2016	$	2,870		$	702		$	—		$	3,572

Identifiable Intangible Assets with Finite Lives

The Company’s identifiable intangible assets with finite lives are being amortized over their estimated useful lives and are detailed below.

	December 31, 2016							December 31, 2015
($ in millions)	Gross Carrying Amount		Accumulated Amortization			Net		Gross Carrying Amount		Accumulated Amortization			Net
Acquired  technology	$	587	$	(446	)	$	141	$	572	$	(421	)	$	151
Customer-related intangibles	1,272		(618		)	654		1,267		(574		)	693
Tradenames	142		(71		)	71		132		(61		)	71
Other	38		(28		)	10		39		(26		)	13
Balance	$	2,039	$	(1,163	)	$	876	$	2,010	$	(1,082	)	$	928

Aggregate amortization expense was $121 million, $132 million and $126 million in 2016, 2015 and 2014, respectively. The estimated future amortization expense of identifiable intangible assets per year is as follows:

($ in millions)	2017		2018		2019		2020		2021
Estimated future amortization expense	$	120	$	115	$	100	$	90	$	85