i)	Reconciliation of carrying amount


	Computers			Buildings and renovation			Motor vehicles held for leasing			Office and other equipment			Total
(in $ millions)	$			$			$			$			$
Cost
At January 1, 2020		45			117			564			33			759
Additions		6			30			23			4			63
Write-offs/disposal		(2	)		(20	)		(104	)		(1	)		(127	)
Effects of movements in exchange rates		1			2			3			*			6
At December 31, 2020		50			129			486			36			701
Additions		16			136			41			6			199
Write-offs/disposal		(3	)		(39	)		(48	)		(2	)		(92	)
Effects of movements in exchange rates		(1	)		2			(9	)		(1	)		(9	)
At December 31, 2021		62			228			470			39			799


	Computers			Buildings and renovation			Motor vehicles held for leasing			Office and other equipment			Total
(in $ millions)	$			$			$			$			$
Accumulated depreciation and impairment losses
At January 1, 2020		20			46			148			11			225
Depreciation for the year		15			39			65			7			126
Write-offs/disposal		(1	)		(15	)		(39	)		*			(55	)
Impairment loss		—			*			15			—			15
Effects of movements in exchange rates		1			2			3			*			6
At December 31, 2020		35			72			192			18			317
Depreciation for the year		16			34			53			6			109
Write-offs/disposal		(3	)		(39	)		(24	)		(2	)		(68	)
Impairment loss		—			1			6			—			7
Effects of movements in exchange rates		(1	)		(1	)		(4	)		(1	)		(7	)
At December 31, 2021		47			67			223			21			358
Carrying amounts
At January 1, 2020		25			71			416			22			534
At December 31, 2020		15			57			294			18			384
At December 31, 2021		15			161			247			18			441

Amount less than $1 million

Property, plant and equipment includes

right-of-use

assets of $118 million (2020: $39 million) relating to leased properties and motor vehicles (see Note 24).

During the financial year, the Group acquired motor vehicles with an aggregate cost of $41 million (2020: $23 million) comprising cash payments of $21 million (2020: $6 million) and secured bank loan financing of $20 million (2020: $17 million).

ii)	Depreciation of property, plant and equipment

Property, plant and equipment is depreciated on a straight-line basis over the estimated useful lives, after taking into account the estimated residual value. Management reviews the estimated useful lives and residual value of the assets annually in order to determine the amount of depreciation expense to be recorded during any reporting year. The depreciation expense recorded for the year is $109 million (2020: $126 million; 2019: $109 million).

The reviews performed in 2021 and 2020 did not result in any changes in estimated useful life or residual value.

iii)	Impairment of motor vehicles held for leasing

Following a drop in rental rates and utilization rates, the Group performed an impairment review of its motor vehicles held for leasing and recognized an impairment loss of

$6 million (2020: $15

million; 2019: $32 million) which is presented in ‘Cost of revenue’.

The recoverable amount of motor vehicles

based on its value in use, determined by discounting

post-tax

future cash flows to be generated from the continuing use of the motor vehicles leasing business over the reduced useful life.

Key assumptions used in the estimate of value in use were as follows:

2021

2020

2019

Discount rate

6.6 to 12

6.9 to 12

6.7 to 12

Budgeted rental rate growth/(decline)

0 to 1.8

0 to 4

(1) to 0

Utilization rates

46 to 94

45 to 95

93 to 97

The discount rates applied were

post-tax

measures based on weighted average cost of capital. The

pre-tax

discount rates were

12.2% to 18.8% (2020: 11.7% to 25.1

%; 2019: 11.4% to 25.4%). The budgeted rental rates growth was estimated based on historic trends adjusted for estimated future growth rates of the motor vehicles leasing business. Utilization rates were estimated based on historic trends and adjusted for estimated future utilization rates.