Other comprehensive income

12 Months Ended

Dec. 31, 2024

Disclosure of analysis of other comprehensive income by item [abstract]

Other comprehensive income

Other comprehensive income (loss)

	Items that may subsequently be reclassified to income
(millions)	Change in unrealized fair value of cash flow hedges		Cumulative foreign currency translation adjustment		Accumulated other comprehensive income (loss)
Accumulated balance as at January 1, 2022	$	(11)	$	45	$	34
Other comprehensive income (loss)
Amount arising	48		(89)		(41)
Income taxes	(5)		—		(5)
Net	43		(89)		(46)
Accumulated balance as at December 31, 2022	$	32	$	(44)	$	(12)
Other comprehensive income (loss)
Amount arising	(29)		26		(3)
Income taxes	2		—		2
Net	(27)		26		(1)
Accumulated balance as at December 31, 2023	$	5	$	(18)	$	(13)
Other comprehensive income (loss)
Amount arising	25		(77)		(52)
Income taxes	(1)		—		(1)
Net	$	24	$	(77)	$	(53)
Accumulated balance as at December 31, 2024	$	29	$	(95)	$	(66)