
	December 31, 2024
	Cost	Accumulated depreciation and impairment	Net book value
	(in US $ millions)
Leasehold improvements	149	115	34
Computer equipment	40	29	11
Furniture and equipment	28	26	2
	217	170	47


	December 31, 2023
	Cost	Accumulated depreciation and impairment	Net book value
	(in US $ millions)
Leasehold improvements(1)	142	107	35
Computer equipment	37	24	13
Furniture and equipment	26	25	1
	205	156	49

(1) $12 million of leasehold improvements that were impaired and disposed of in the year ended December 31, 2023. See Note 11 for details.

During the year ended December 31, 2024, the Company disposed of and retired computer equipment with an original cost of $8 million (December 31, 2023 - $6 million). There was no material gain or loss recognized in the consolidated statement of operations and comprehensive income (loss) as a result of the retirement and disposal of these assets.

The following table illustrates the classification of depreciation in the consolidated statement of operations and comprehensive income (loss):


	Years ended
	December 31, 2024	December 31, 2023	December 31, 2022

	(in US $ millions)
Cost of revenues	—	3	4
Sales and marketing	7	7	8
Research and development	11	13	18
General and administrative	4	5	6
	22	28	36