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Accumulated Other Comprehensive Income
 12 Months Ended
Dec. 31, 2023
Equity [Abstract]  
Accumulated Other Comprehensive Income ACCUMULATED OTHER COMPREHENSIVE INCOME
($ millions)Opening BalanceNet ChangeEnding Balance
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 
2022
Unrealized foreign currency translation gains (losses)
Net investments in foreign operations273 1,222 1,495 
Hedges of net investments in foreign operations(276)(254)(530)
Income tax (expense) recovery(8)15 7 
(11)983 972 
Other
Interest rate hedges (Note 26)(5)54 49 
Unrealized employee future benefits (losses) gains (Note 24)(36)30 (6)
Income tax recovery (expense)12 (19)(7)
(29)65 36 
Accumulated other comprehensive income(40)1,048 1,008