Property, plant and equipment (Tables)

12 Months Ended

Dec. 31, 2024

Disclosure of detailed information about property, plant and equipment [abstract]

Schedule of property, plant and equipment

	Owned Assets										Right-of- use lease assets
(millions)	Network assets		Buildings and leasehold improvements		Computer equipment, furniture, and other		Assets under construction		Total		Buildings		Total
At cost
As at January 1, 2023	$	49	$	138	$	257	$	33	$	477	$	385	$	862
Additions	3		3		19		54		79		92		171
Additions from acquisition	—		10		5		—		15		19		34
Dispositions, retirements and other	—		(1)		(9)		—		(10)		(13)		(23)
Transfers	7		8		35		(50)		—		—		—
Foreign exchange	—		1		1		—		2		4		6
As at December 31, 2023	$	59	$	159	$	308	$	37	$	563	$	487	$	1,050
Additions	4		3		19		46		72		22		94
Dispositions, retirements and other	(10)		—		(43)		—		(53)		(22)		(75)
Transfers	5		10		31		(46)		—		—		—
Foreign exchange	(3)		(2)		(3)		—		(8)		(8)		(16)
As at December 31, 2024	$	55	$	170	$	312	$	37	$	574	$	479	$	1,053
Accumulated depreciation
As at January 1, 2023	$	31	$	53	$	160	$	—	$	244	$	169	413
Depreciation	8		22		46		—		76		65		141
Dispositions, retirements and other	—		(1)		(9)		—		(10)		(13)		(23)
Foreign exchange	—		1		—		—		1		1		2
As at December 31, 2023	$	39	$	75	$	197	$	—	$	311	$	222	$	533
Depreciation	9		19		52		—		80		64		144
Dispositions, retirements and other	(10)		—		(43)		—		(53)		(17)		(70)
Foreign exchange	(1)		—		(1)		—		(2)		(8)		(10)
As at December 31, 2024	$	37	$	94	$	205	$	—	$	336	$	261	$	597
Net Book Value
As at December 31, 2023	$	20	$	84	$	111	$	37	$	252	$	265	$	517
As at December 31, 2024	$	18	$	76	$	107	$	37	$	238	$	218	$	456