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Goodwill and Intangible Assets, Net
 12 Months Ended
Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets, Net Goodwill and Intangible Assets, Net
The following table presents our goodwill and intangible assets as of December 31, 2024 and 2023:
 December 31,
 20242023
 (In millions)
Goodwill$6,844 $6,849 
Intangible assets with indefinite lives763 912 
Intangible assets with definite lives, net54 111 
$7,661 $7,872 
Impairment Assessments. We perform our annual assessment of possible impairment of goodwill and indefinite-lived intangible assets as of October 1, or more frequently if events and circumstances indicate that an impairment may have occurred.
During the third quarter of 2024, we recognized intangible impairment charges of $33 million related to an indefinite-lived trade name within our trivago segment that resulted from a decline in revenue in the current year as well as trivago's share price decline, which reduced its total market capitalization relative to its net assets. In addition, during our annual assessment of goodwill and intangible assets during the fourth quarter of 2024, we recognized intangible impairment charges of $114 million related to an indefinite-lived trade name within our B2C segment.
During 2023, due to a strategic shift at trivago, which included intensifying its brand marketing investments with an anticipated decrease in profitability, in addition to our annual assessment, we deemed it necessary to perform an interim assessment of goodwill and intangible assets. As a result of the assessment during the third quarter of 2023, we recognized a goodwill impairment charge of $297 million related to our trivago segment as well as intangible impairment charges of $15 million related to indefinite-lived trade name within our trivago segment. In addition, during the fourth quarter of 2023, we recognized intangible impairment charges of $114 million related to indefinite-lived trade names within our B2C segment.
During 2022, we recognized intangible impairment charges of $81 million related to an indefinite-lived trade name within our trivago segment.
Goodwill. The following table presents the changes in goodwill by reportable segment:
B2CB2BtrivagoTotal
 (In millions)
Balance as of December 31, 2022$6,433 $412 $298 $7,143 
Impairment charges— — (297)(297)
Foreign exchange translation and other3 1 (1)3 
Balance as of December 31, 20236,436 413 — 6,849 
Foreign exchange translation and other(3)(2)— (5)
Balance as of December 31, 2024$6,433 $411 $— $6,844 
As of December 31, 2024 and 2023, accumulated goodwill impairment losses in total were $3.6 billion, of which $3.0 billion was associated with our B2C segment, $537 million was associated with our trivago segment and $14 million was associated with our B2B segment.
Indefinite-lived Intangible Assets. Our indefinite-lived intangible assets relate principally to trade names and trademarks acquired in various acquisitions.
Intangible Assets with Definite Lives. The following table presents the components of our intangible assets with definite lives as of December 31, 2024 and 2023:
 December 31, 2024December 31, 2023
 CostAccumulated
Amortization		NetCostAccumulated
Amortization		Net
 (In millions)
Customer relationships$380 $(369)$11 $382 $(353)$29 
Supplier relationships475 (474)1 480 (471)9 
Domain names166 (145)21 167 (131)36 
Other648 (627)21 689 (652)37 
Total$1,669 $(1,615)$54 $1,718 $(1,607)$111 
Amortization expense was $57 million, $59 million and $88 million for the years ended December 31, 2024, 2023 and 2022. The estimated future amortization expense related to intangible assets with definite lives as of December 31, 2024, assuming no subsequent impairment of the underlying assets, is as follows, in millions:
2025$38 
202612 
20274 
Total$54