Goodwill and indefinite-lived intangible assets, primarily trade names, are not amortized and are subject to assessment for impairment by applying a fair-value based test on an annual basis or more frequently if circumstances indicate a potential impairment. There were no impairment charges recorded in the three and nine months ended September 30, 2020 and 2019. There were no accumulated impairment losses recorded as of September 30, 2020. Customer relationships and Other intangible assets, which primarily includes trade names subject to amortization, are amortized over their respective useful lives. The table below summarizes the goodwill balances for continuing operations by reportable segment and European Pest Control and Other:


			European Pest
(In millions)	Terminix		Control and Other⁽¹⁾		Total
Balance as of December 31, 2019	$	1,946	$	150	$	2,096
Acquisitions		10		—		10
Purchase accounting adjustments		—		26		26
Impact of foreign exchange rates		(1)		(4)		(5)
Balance as of September 30, 2020	$	1,956	$	171	$	2,127

(1)European Pest Control and Other includes goodwill related to pest control operations in Europe.

The table below summarizes the other intangible asset balances for continuing operations:



	As of September 30, 2020						As of December 31, 2019
			Accumulated						Accumulated
(In millions)	Gross		Amortization		Net		Gross		Amortization		Net
Trade names⁽¹⁾	$	888	$	—	$	888	$	888	$	—	$	888
Customer relationships⁽²⁾		640		(443)		197		659		(423)		236
Other⁽³⁾		68		(41)		28		79		(34)		45
Total	$	1,596	$	(483)	$	1,113	$	1,626	$	(457)	$	1,169

(2)Includes purchase accounting adjustments subsequent to December 31, 2019, primarily related to our acquisition of Nomor, of approximately $17 million.

(3)Includes purchase accounting adjustments subsequent to December 31, 2019, primarily related to our acquisition of Nomor, of approximately $9 million.

For the existing intangible assets, we anticipate amortization expense for the remainder of 2020 and each of the next five years as follows:


(In millions)	2020		2021		2022		2023		2024		2025
Amortization expense	$	8	$	35	$	33	$	30	$	22	$	18