Other comprehensive income (Tables)

12 Months Ended

Dec. 31, 2023

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

Schedule of other comprehensive income


						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
Accumulated balance as at January 1, 2021						$	(51)					$	140											$	89
Other comprehensive income (loss)
Amount arising						41						(95)												(54)
Income taxes						(1)						—												(1)
Net						40						(95)												(55)
Accumulated balance as at December 31, 2021						$	(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)