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Accumulated Other Comprehensive Income (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance $ 21,030  
Ending balance 21,505 $ 21,030
Net investments in foreign operations    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Accumulated other comprehensive income (loss), before tax, opening balance 1,495 273
Other comprehensive income (loss), before tax (436) 1,222
Accumulated other comprehensive income (loss), before tax, ending balance 1,059 1,495
Hedges of net investments in foreign operations    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Accumulated other comprehensive income (loss), before tax, opening balance (530) (276)
Other comprehensive income (loss), before tax 78 (254)
Accumulated other comprehensive income (loss), before tax, ending balance (452) (530)
Net unrealized foreign currency translation gains (losses)    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Income tax recovery (expense), opening balance 7 (8)
Beginning balance 972 (11)
Other comprehensive income (loss) tax (expense) recovery (3) 15
Other comprehensive income (loss) (361) 983
Income tax recovery (expense), ending balance 4 7
Ending balance 611 972
Interest rate hedges    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Accumulated other comprehensive income (loss), before tax, opening balance 49 (5)
Other comprehensive income (loss), before tax 13 54
Accumulated other comprehensive income (loss), before tax, ending balance 62 49
Unrealized employee future benefits losses (Note 24)    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Accumulated other comprehensive income (loss), before tax, opening balance (6) (36)
Other comprehensive income (loss), before tax (3) 30
Accumulated other comprehensive income (loss), before tax, ending balance (9) (6)
Cash flow hedges and unrealized employee future benefits (losses) gains    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Income tax recovery (expense), opening balance (7) 12
Beginning balance 36 (29)
Other comprehensive income (loss) tax (expense) recovery (4) (19)
Other comprehensive income (loss) 6 65
Income tax recovery (expense), ending balance (11) (7)
Ending balance 42 36
Accumulated other comprehensive income    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance 1,008 (40)
Other comprehensive income (loss) (355) 1,048
Ending balance $ 653 $ 1,008