GOODWILL AND OTHER INTANGIBLE ASSETS

6 Months Ended

Jun. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible assets and goodwill consist of the following (in millions):



June 30, 2018	Weighted Average Useful Life	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Amortizable intangible assets:
Customer relationships	20	$	559	$	(124	)	$	435
Technology	17	323		(124		)	199
Other	15	58		(28		)	30
Indefinite-lived intangible assets:
Trademarks		1,147		—			1,147
Total intangible assets		$	2,087	$	(276	)	$	1,811
Goodwill		$	1,968



December 31, 2017	Weighted Average Useful Life	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Amortizable intangible assets:
Customer relationships	20	$	363	$	(109	)	$	254
Technology	18	255		(116		)	139
Other	8	47		(26		)	21
Indefinite-lived intangible assets:
Trademarks		946		—			946
Total intangible assets		$	1,611	$	(251	)	$	1,360
Goodwill		$	1,507

Goodwill

The Company tests goodwill and indefinite-lived intangible assets for impairment during the fourth quarter of each year, or more frequently should circumstances change or events occur that would more likely than not reduce the fair value of a reporting unit below its carrying amount. No testing was deemed necessary in the first six months of 2018. The changes in the net carrying amount of goodwill by segment are as follows (in millions):



	Composites			Insulation			Roofing			Total
Balance at December 31, 2017	$	58		$	1,049		$	400		$	1,507
Acquisitions (see Note 8)	—			505			—			505
Foreign currency translation	(1		)	(41		)	(2		)	(44		)
Balance at June 30, 2018	$	57		$	1,513		$	398		$	1,968

Other Intangible Assets

The Other category below primarily includes franchise agreements and quarry and emission rights. The changes in the gross carrying amount of intangible assets by asset group are as follows (in millions):



	Customer Relationships			Technology			Trademarks			Other		Total
Balance at December 31, 2017	$	363		$	255		$	946		$	47	$	1,611
Acquisitions (see Note 8)	215			73			213			7		508
Other additions, net	—			—			—			4		4
Foreign currency translation	(19		)	(5		)	(12		)	—		(36		)
Balance at June 30, 2018	$	559		$	323		$	1,147		$	58	$	2,087

The estimated amortization expense for intangible assets for the next five years is as follows (in millions):



Period	Amortization (a)
2019	$	51
2020	$	51
2021	$	50
2022	$	46
2023	$	43

(a)

The yearly amortization amounts in the table above include approximately $24 million of aggregate amortization expense related to the purchase price allocation of the acquisition of Pittsburgh Corning Corporation and Pittsburgh Corning Europe NV (collectively, "Pittsburgh Corning") and the preliminary purchase price allocation of the Paroc acquisition. See Note 8 for more details of these acquisitions.

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

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