The following table presents the company's intangible asset balances by major asset class:

* Amounts as of June 30, 2020 and December 31, 2019 include a decrease in net intangible asset balances of $6 million and $42 million, respectively, due to foreign currency translation.

**	Other intangibles are primarily acquired proprietary and non-proprietary business processes, methodologies and systems.

The net carrying amount of intangible assets decreased $965 million during the first six months of 2020, primarily due to intangible asset amortization, partially offset by additions of capitalized software. The aggregate intangible amortization expense was $623 million and $1,245 million for the second quarter and first six months of 2020, respectively, versus $307 million and $610 million for the second quarter and first six months of 2019, respectively. The increase in intangible amortization expense was primarily due to an increase in the gross carrying amount of intangible assets from the Red Hat acquisition which closed in the third quarter of 2019. In addition, in the first six months of 2020, the company retired $913 million of fully amortized intangible assets, impacting both the gross carrying amount and accumulated amortization by this amount.

The future amortization expense relating to intangible assets currently recorded in the Consolidated Balance Sheet is estimated to be the following at June 30, 2020:


	Capitalized		Acquired
(Dollars in millions)	Software		Intangibles		Total
Remainder of 2020	$	288	$	905	$	1,193
2021		445		1,748		2,193
2022		215		1,686		1,901
2023		35		1,373		1,407
2024		0		1,323		1,323
Thereafter		—		6,251		6,251

Goodwill

The changes in the goodwill balances by segment for the six months ended June 30, 2020 and for the year ended December 31, 2019 are as follows:


									Foreign
									Currency
					Purchase				Translation
(Dollars in millions)	Balance		Goodwill		Price				And Other		Balance
Segment	1/1/2020		Additions		Adjustments		Divestitures		Adjustments**		6/30/2020
Cloud & Cognitive Software	$	43,037	$	11	$	(139)	$	—	$	(147)	$	42,762
Global Business Services		5,775		—		—		—		(45)		5,730
Global Technology Services		7,141		—		—		—		(61)		7,080
Systems		2,270		—		—		—		(8)		2,261
Other—divested businesses		—		—		—		—		—		—
Total	$	58,222	$	11	$	(139)	$	—	$	(260)	$	57,833


									Foreign
									Currency
					Purchase				Translation
(Dollars in millions)	Balance		Goodwill		Price				And Other		Balance
Segment	1/1/2019		Additions		Adjustments		Divestitures		Adjustments**		12/31/2019
Cloud & Cognitive Software*	$	24,463	$	18,399	$	133	$	—	$	41	$	43,037
Global Business Services		4,711		1,059		1		(1)		5		5,775
Global Technology Services		3,988		3,119		—		—		34		7,141
Systems		1,847		525		(110)		—		7		2,270
Other—divested businesses*		1,256		—		—		(1,256)		—		—
Total	$	36,265	$	23,102	$	24	$	(1,257)	$	87	$	58,222

* Recast to conform to 2020 presentation.

** Primarily driven by foreign currency translation.

There were no goodwill impairment losses recorded during the first six months of 2020 or full year 2019 and the company has no accumulated impairment losses.

Purchase price adjustments recorded in the first six months of 2020 and full year 2019 were related to acquisitions that were still subject to the measurement period that ends at the earlier of 12 months from the acquisition date or when information becomes available. During the first six months of 2020, net purchase price adjustments recorded to noncurrent tax assets and liabilities were related to the Red Hat acquisition. Net purchase price adjustments recorded in full-year 2019 were not material.