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Derivatives Instruments (Realized and Unrealized Gains (Losses) on Other Derivatives) (Details)
shares in Millions, $ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2024
CAD ($)
Dec. 31, 2023
CAD ($)
Dec. 31, 2024
USD ($)
shares
Derivative Instruments, Gain (Loss) [Line Items]      
Equity derivative hedges, return of shares | shares     2.9
FX forwards      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized gains (loss) $ (56) $ 17  
Combined notional amount     $ 520
FX forwards | OM&G      
Derivative Instruments, Gain (Loss) [Line Items]      
Unrealized gain (loss) 0 0  
Realized gains (loss) 0 0  
FX forwards | Other income, net      
Derivative Instruments, Gain (Loss) [Line Items]      
Unrealized gain (loss) (44) 28  
Realized gains (loss) (12) (11)  
Equity derivatives      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized gains (loss) 14 (9)  
Equity derivatives | OM&G      
Derivative Instruments, Gain (Loss) [Line Items]      
Unrealized gain (loss) (2) 4  
Realized gains (loss) 16 (13)  
Equity derivatives | Other income, net      
Derivative Instruments, Gain (Loss) [Line Items]      
Unrealized gain (loss) 0 0  
Realized gains (loss) $ 0 $ 0