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Intangible Assets and Goodwill
 12 Months Ended
Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets and Goodwill Intangible Assets and Goodwill
Intangible Assets

Identifiable intangible assets consisted of the following (in millions):

December 31, 2021December 31, 2022
Gross
Carrying
Amount (1)
Accumulated
Amortization (1)
Net
Carrying
Value
Gross
Carrying
Amount (1)
Accumulated
Amortization (1)
Net
Carrying
Value
Listing relationships$43 $(16)$27 $35 $(13)$22 
Trade names33 (18)15 33 (25)8 
Developed technology23 (21)2 — — — 
Customer contacts4 (4)— — — — 
Other10 (2)8 9 (5)4 
Total intangible assets$113 $(61)$52 $77 $(43)$34 
(1)Excludes write off of intangible assets that have been fully amortized.

Amortization expense related to intangible assets for the years ended December 31, 2020, 2021, and 2022 was $36.2 million, $23.7 million, and $19.1 million, respectively.

Estimated future amortization expense for intangible assets as of December 31, 2022 was as follows (in millions):

Year Ending December 31,Amount
2023$11 
20246 
20255 
20264 
20274 
Thereafter4 
Total future amortization expense$34 
Goodwill

The changes in the carrying amount of goodwill for the years ended December 31, 2021 and 2022 were as follows (in millions):

Amount
Balance as of December 31, 2020$656 
Foreign currency translation adjustments(3)
Balance as of December 31, 2021653 
Foreign currency translation adjustments(3)
Balance as of December 31, 2022$650