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Accumulated Other Comprehensive Income (Tables)
12 Months Ended
Dec. 31, 2023
Equity [Abstract]  
Change in Accumulated Other Comprehensive Income by Category
($ 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 
(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