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Accumulated Other Comprehensive Income
 12 Months Ended
Dec. 31, 2024
Equity [Abstract]  
Accumulated Other Comprehensive Income ACCUMULATED OTHER COMPREHENSIVE INCOME
($ millions)Opening BalanceNet ChangeEnding Balance
2024
Unrealized foreign currency translation gains (losses)
Net investments in foreign operations1,059 1,653 2,712 
Hedges of net investments in foreign operations(452)(262)(714)
Income tax recovery4 14 18 
611 1,405 2,016 
Other
Interest rate hedges (Note 26)62 10 72 
Unrealized employee future benefits (losses) gains (Note 24)(9)2 (7)
Income tax expense(11)(3)(14)
42 9 51 
Accumulated other comprehensive income653 1,414 2,067 
2023
Unrealized foreign currency translation gains (losses)
Net investments in foreign operations1,495 (436)1,059 
Hedges of net investments in foreign operations(530)78 (452)
Income tax recovery (expense)7 (3)4 
972 (361)611 
Other
Interest rate hedges (Note 26)49 13 62 
Unrealized employee future benefits losses (Note 24)(6)(3)(9)
Income tax expense(7)(4)(11)
36 6 42 
Accumulated other comprehensive income1,008 (355)653