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Goodwill and Other Intangible Assets
 6 Months Ended
Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets
Goodwill    
Changes in the carrying value of goodwill by reportable segment for the six months ended June 30, 2021 are as follows:
(in millions)
Water
Infrastructure
Applied WaterMeasurement & Control SolutionsTotal
Balance as of January 1, 2021$668 $529 $1,657 $2,854 
Activity in 2021
Foreign currency and other— (5)(8)(13)
Balance as of June 30, 2021$668 $524 $1,649 $2,841 
As of June 30, 2021, goodwill included an accumulated impairment loss of $206 million within the Measurement & Control Solutions segment.
Other Intangible Assets
Information regarding our other intangible assets is as follows:
June 30, 2021December 31, 2020
(in millions)
Carrying
Amount
Accumulated
Amortization
Net
Intangibles
Carrying
Amount
Accumulated
Amortization
Net
Intangibles
Customer and distributor relationships$941 $(436)$505 $941 $(410)$531 
Proprietary technology and patents206 (138)68 206 (131)75 
Trademarks143 (68)75 143 (63)80 
Software523 (284)239 500 (265)235 
Other21 (19)2 21 (18)3 
Indefinite-lived intangibles169 — 169 169 — 169 
Other Intangibles$2,003 $(945)$1,058 $1,980 $(887)$1,093 
Amortization expense related to finite-lived intangible assets was $33 million and $65 million for the three and six month periods ended June 30, 2021, respectively, and $33 million and $68 million for the three and six month periods ended June 30, 2020, respectively.
During the second quarter of 2020, we recognized impairment charges of $16 million primarily related to customer relationships and trademarks due to discontinuance of a product line within our Measurement & Control Solutions segment. We also determined that internally developed in-process software within our Measurement & Control Solutions segment was impaired as a result of actions taken to prioritize strategic investments and recognized an impairment charge of $10 million.