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Financial and capital management - Market Risk Narrative (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
CAD ($)
Dec. 31, 2023
CAD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Nov. 14, 2023
CAD ($)
Aug. 11, 2023
CAD ($)
May 11, 2023
CAD ($)
May 11, 2023
USD ($)
Feb. 09, 2023
CAD ($)
Disclosure of detailed information about hedged items [line items]                  
Early debt redemption costs $ 0 $ 1              
Gains (losses) on change in fair value of derivatives $ 269 103              
Currency risk                  
Disclosure of detailed information about hedged items [line items]                  
Percentage of possible change in risk variable 10.00%   10.00%            
Currency risk | Top of range                  
Disclosure of detailed information about hedged items [line items]                  
Reasonably possible change in risk variable impact on net earnings $ (1)                
Sensitivity analysis for types of market risk, reasonably possible change in risk variable, impact on equity 119                
Currency risk | Bottom of range                  
Disclosure of detailed information about hedged items [line items]                  
Reasonably possible change in risk variable impact on net earnings 73                
Sensitivity analysis for types of market risk, reasonably possible change in risk variable, impact on equity $ (107)                
Interest rate risk                  
Disclosure of detailed information about hedged items [line items]                  
Percentage of possible change in risk variable 1.00%   1.00%            
Interest rate risk | Bottom of range                  
Disclosure of detailed information about hedged items [line items]                  
Reasonably possible change in risk variable impact on net earnings $ 28                
Equity price risk                  
Disclosure of detailed information about hedged items [line items]                  
Percentage of possible change in risk variable 5.00%   5.00%            
Reasonably possible change in risk variable impact on net earnings $ (18)                
Gains (losses) on change in fair value of derivatives 269 103              
Interest rate swap contract | Maturing in 2025                  
Disclosure of detailed information about hedged items [line items]                  
Notional amount 50                
Interest rate swap contract | Currency risk                  
Disclosure of detailed information about hedged items [line items]                  
Notional amount   644              
Financial assets, at fair value 21                
Interest rate swap contract | Currency risk | Maturing in 2026                  
Disclosure of detailed information about hedged items [line items]                  
Notional amount 324   $ 240            
Interest rate swap contract | Interest rate risk                  
Disclosure of detailed information about hedged items [line items]                  
Hedging instrument, assets 6                
Interest rate swap contract | Fair value hedges | Currency risk                  
Disclosure of detailed information about hedged items [line items]                  
Notional amount   491   $ 360          
Financial assets, at fair value 28 28              
Fair value 15 15              
Forward Starting Interest Rate Swap                  
Disclosure of detailed information about hedged items [line items]                  
Notional amount 1,080   800            
Notional amount, swaps terminated 338   250            
Notional amount, swaps unterminated 742   550            
Forward Starting Interest Rate Swap | Maturing in 2030                  
Disclosure of detailed information about hedged items [line items]                  
Notional amount     400            
Notional amount, swaps unterminated 275                
Forward Starting Interest Rate Swap | Maturing In 2035                  
Disclosure of detailed information about hedged items [line items]                  
Notional amount     400            
Notional amount, swaps unterminated 275                
Forward Starting Interest Rate Swap | Interest rate risk                  
Disclosure of detailed information about hedged items [line items]                  
Hedging instrument, assets 38                
Hedging instrument, assets terminated 7                
Interest Rate Swaptions | Maturing in 2024                  
Disclosure of detailed information about hedged items [line items]                  
Notional amount 289   214            
Interest Rate Floor | Maturing in 2029                  
Disclosure of detailed information about hedged items [line items]                  
Notional amount 350                
Interest Rate Floor | Interest rate risk                  
Disclosure of detailed information about hedged items [line items]                  
Hedging instrument, liabilities 2                
Interest Rate Options | Interest rate risk                  
Disclosure of detailed information about hedged items [line items]                  
Hedging instrument, assets 1                
Amortizing Interest Rate Swap | Interest rate risk                  
Disclosure of detailed information about hedged items [line items]                  
Fair value 4 2              
Amortizing Interest Rate Swap | Interest rate risk | Maturing in 2028                  
Disclosure of detailed information about hedged items [line items]                  
Notional amount 123 197              
Forward contract | Equity price risk                  
Disclosure of detailed information about hedged items [line items]                  
Hedging instrument, liabilities 429 162              
Series US-9 Notes | Currency risk                  
Disclosure of detailed information about hedged items [line items]                  
Financial assets, at fair value 5                
Series US-9 Notes | Interest rate swap contract | Fair value hedges | Currency risk                  
Disclosure of detailed information about hedged items [line items]                  
Notional amount 942   700            
Series US-10 Notes | Currency risk                  
Disclosure of detailed information about hedged items [line items]                  
Fair value 44                
Series US-10 Notes | Interest rate swap contract | Currency risk | Maturing in 2054                  
Disclosure of detailed information about hedged items [line items]                  
Notional amount 1,009   $ 750            
Series US-10 Notes | Forward Starting Interest Rate Swap | Maturing in 2054                  
Disclosure of detailed information about hedged items [line items]                  
Notional amount 336                
Series US-10 Notes | Forward Starting Interest Rate Swap | Interest rate risk                  
Disclosure of detailed information about hedged items [line items]                  
Hedging instrument, assets 20                
Series US-8 Notes                  
Disclosure of detailed information about hedged items [line items]                  
Notional amount             $ 1,138 $ 850  
Series US-8 Notes | Currency risk                  
Disclosure of detailed information about hedged items [line items]                  
Fair value 37 37              
Series US-8 Notes | Interest rate swap contract | Currency risk | Maturing in 2033                  
Disclosure of detailed information about hedged items [line items]                  
Notional amount   1,138   $ 850          
Series US-8 Notes | Interest rate swap contract | Fair value hedges | Currency risk                  
Disclosure of detailed information about hedged items [line items]                  
Financial assets, at fair value 11 11              
Series M-53 Medium Term Notes Debentures | Interest rate swap contract | Maturing in 2027                  
Disclosure of detailed information about hedged items [line items]                  
Notional amount 625                
Series M-53 Medium Term Notes Debentures | Interest Rate Swaptions                  
Disclosure of detailed information about hedged items [line items]                  
Notional amount 625 250              
Hedging instrument, liabilities 6                
Series M-53 Medium Term Notes Debentures | Interest Rate Swaptions | Maturing in 2027                  
Disclosure of detailed information about hedged items [line items]                  
Notional amount 750                
Series M-53 Medium Term Notes Debentures | Interest Rate Swaptions | Interest rate risk                  
Disclosure of detailed information about hedged items [line items]                  
Notional amount   425              
Series M-52 Medium Term Notes Debentures | Interest rate swap contract | Maturing in 2030                  
Disclosure of detailed information about hedged items [line items]                  
Notional amount 250                
Series M-52 Medium Term Notes Debentures | Interest rate swap contract | Interest rate risk                  
Disclosure of detailed information about hedged items [line items]                  
Notional amount   125              
Financial assets, at fair value 11 12              
Hedging instrument, assets 6                
Series M-52 Medium Term Notes Debentures | Interest rate swap contract | Interest rate risk | Maturing in 2030                  
Disclosure of detailed information about hedged items [line items]                  
Notional amount   375              
Series M-52 Medium Term Notes Debentures | Interest Rate Swaptions | Interest rate risk                  
Disclosure of detailed information about hedged items [line items]                  
Notional amount   375              
Early debt redemption costs   1              
Series M-57 Medium Term Notes Debentures                  
Disclosure of detailed information about hedged items [line items]                  
Notional amount         $ 300        
Series M-57 Medium Term Notes Debentures | Interest rate swap contract                  
Disclosure of detailed information about hedged items [line items]                  
Notional amount 375                
Series M-57 Medium Term Notes Debentures | Interest rate swap contract | Maturing in 2032                  
Disclosure of detailed information about hedged items [line items]                  
Notional amount 150                
Series M-57 Medium Term Notes Debentures | Interest rate swap contract | Interest rate risk                  
Disclosure of detailed information about hedged items [line items]                  
Notional amount   125              
Financial assets, at fair value 19 24              
Series M-57 Medium Term Notes Debentures | Interest rate swap contract | Interest rate risk | Maturing in 2032                  
Disclosure of detailed information about hedged items [line items]                  
Notional amount   125              
Series M-57 Medium Term Notes Debentures | Interest Rate Swaptions | Interest rate risk                  
Disclosure of detailed information about hedged items [line items]                  
Early debt redemption costs   (2)              
Series M-17 Medium Term Notes Debentures | Interest Rate Swaptions | Maturing In 2035                  
Disclosure of detailed information about hedged items [line items]                  
Notional amount 300                
Series M-62 Medium Term Notes Debentures                  
Disclosure of detailed information about hedged items [line items]                  
Notional amount         $ 700        
Series M-62 Medium Term Notes Debentures | Forward Starting Interest Rate Swap | Maturing in 2029                  
Disclosure of detailed information about hedged items [line items]                  
Notional amount   700              
Series M-62 Medium Term Notes Debentures | Forward Starting Interest Rate Swap | Interest rate risk                  
Disclosure of detailed information about hedged items [line items]                  
Financial assets, at fair value 27 22              
Series M-62 Medium Term Notes Debentures | Interest Rate Options | Maturing in 2029                  
Disclosure of detailed information about hedged items [line items]                  
Notional amount 440                
Series M-59 Medium Term Notes Debentures                  
Disclosure of detailed information about hedged items [line items]                  
Notional amount                 $ 450
Series M-59 Medium Term Notes Debentures | Forward Starting Interest Rate Swap | Interest rate risk | Maturing In 2053                  
Disclosure of detailed information about hedged items [line items]                  
Notional amount   125              
Series M-61 Medium Term Note Debentures                  
Disclosure of detailed information about hedged items [line items]                  
Notional amount           $ 400      
Series M-61 Medium Term Note Debentures | Forward Starting Interest Rate Swap | Interest rate risk                  
Disclosure of detailed information about hedged items [line items]                  
Financial assets, at fair value $ 35 48              
Series M-61 Medium Term Note Debentures | Forward Starting Interest Rate Swap | Interest rate risk | Maturing In 2053                  
Disclosure of detailed information about hedged items [line items]                  
Notional amount   $ 400