Goodwill and Other Identifiable Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2015

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, 2015 and 2014 was as follows:

($ in millions)	Performance Coatings			Industrial Coatings			Glass			Total
Balance, Jan. 1, 2014	$	2,381		$	575		$	52		$	3,008
Goodwill from acquisitions	1,165			—			—			1,165
Goodwill reduction due to divestitures	—			(47		)	—			(47		)
Foreign currency translation	(279		)	(42		)	(4		)	(325		)
Balance, Dec. 31, 2014	$	3,267		$	486		$	48		$	3,801
Goodwill from acquisitions	109			104			—			213
Foreign currency translation	(303		)	(38		)	(4		)	(345		)
Balance, Dec. 31, 2015	$	3,073		$	552		$	44		$	3,669

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.

	Dec. 31, 2015							Dec. 31, 2014
($ in millions)	Gross Carrying Amount		Accumulated Amortization			Net		Gross Carrying Amount		Accumulated Amortization			Net
Acquired  technology	$	572	$	(421	)	$	151	$	560	$	(394	)	$	166
Customer-related intangibles	1,267		(574		)	693		1,302		(570		)	732
Tradenames	132		(61		)	71		134		(60		)	74
Other	39		(26		)	13		42		(24		)	18
Balance	$	2,010	$	(1,082	)	$	928	$	2,038	$	(1,048	)	$	990

Aggregate amortization expense was $132 million, $126 million and $119 million in 2015, 2014 and 2013, respectively. The estimated future amortization expense of identifiable intangible assets per year is as follows:

($ in millions)	2016		2017		2018		2019		2020
Estimated future amortization expense	$	125	$	125	$	120	$	110	$	95