
(millions)	Employee related(1)		Written put options(2)		Other(3)		Total
As at January 1, 2022	$	—	$	—	$	5	$	5
Reversals	—		—		(2)		(2)
As at December 31, 2022	$	—	$	—	$	3	$	3
Current	—		—		1		1
Non-current	—		—		2		2
As at December 31, 2022	$	—	$	—	$	3	$	3
As at January 1, 2023	$	—	$	—	$	3	$	3
Additions	14		194		2		210
Use	(11)		—		—		(11)
Reversals	(2)		—		(1)		(3)
Revaluations	—		(20)		—		(20)
Interest effect and other	—		14		—		14
As at December 31, 2023	$	1	$	188	$	4	$	193
Current	1		—		1		2
Non-current	—		188		3		191
As at December 31, 2023	$	1	$	188	$	4	$	193

(2)In connection with our acquisition of WillowTree, a provision for written put options to acquire the non-controlling interest in the WillowTree business retained by certain members of WillowTree management was established, measured at the present value of the estimated redemption amount (see Note 14(c)—Intangible assets and goodwill—Business acquisitions). During the year ended December 31, 2023, we revised our estimates of certain performance-based criteria tied to the WillowTree business, which resulted in a reduction of the written put option provision by $20 million, included in Changes in business combination-related provisions in our consolidated statements of income and comprehensive income.