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Financial and capital management - Market Risk Narrative (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
CAD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CAD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2023
USD ($)
Nov. 14, 2023
CAD ($)
Aug. 11, 2023
CAD ($)
May 11, 2023
CAD ($)
May 11, 2023
USD ($)
Feb. 09, 2023
CAD ($)
Dec. 31, 2022
USD ($)
Feb. 11, 2022
CAD ($)
Feb. 11, 2022
USD ($)
Disclosure of detailed information about hedged items [line items]                          
Early debt redemption costs $ (1)   $ (18)                    
Net mark-to-market losses on derivatives used to economically hedge equity settled share-based compensation plans (103)   (53)                    
Preferred shares                          
Disclosure of detailed information about hedged items [line items]                          
STATED CAPITAL $ 3,667   3,870                    
Series US-8 Notes                          
Disclosure of detailed information about hedged items [line items]                          
Notional amount               $ 1,138 $ 850        
Series US-7 Notes                          
Disclosure of detailed information about hedged items [line items]                          
Notional amount                       $ 954 $ 750
Series M-62 Medium Term Notes Debentures                          
Disclosure of detailed information about hedged items [line items]                          
Notional amount           $ 700              
Series M-57 Medium Term Notes Debentures                          
Disclosure of detailed information about hedged items [line items]                          
Notional amount           $ 300              
Series M-59 Medium Term Notes Debentures                          
Disclosure of detailed information about hedged items [line items]                          
Notional amount                   $ 450      
Series M-61 Medium Term Note Debentures                          
Disclosure of detailed information about hedged items [line items]                          
Notional amount             $ 400            
Currency risk                          
Disclosure of detailed information about hedged items [line items]                          
Percentage of possible change in risk variable 10.00%       10.00%                
Sensitivity analysis for types of market risk, reasonably possible change in risk variable, impact on equity $ 5                        
Currency risk | Series US-8 Notes                          
Disclosure of detailed information about hedged items [line items]                          
FAIR VALUE 37                        
Currency risk | Series US-7 Notes                          
Disclosure of detailed information about hedged items [line items]                          
FAIR VALUE 132   46                    
Currency risk | Top of range                          
Disclosure of detailed information about hedged items [line items]                          
Reasonably possible change in risk variable impact on net earnings 28                        
Sensitivity analysis for types of market risk, reasonably possible change in risk variable, impact on equity 124                        
Currency risk | Bottom of range                          
Disclosure of detailed information about hedged items [line items]                          
Reasonably possible change in risk variable impact on net earnings (100)                        
Sensitivity analysis for types of market risk, reasonably possible change in risk variable, impact on equity $ (123)                        
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 | Preferred shares                          
Disclosure of detailed information about hedged items [line items]                          
STATED CAPITAL     582                    
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 $ 26                        
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 $ 29                        
Net mark-to-market losses on derivatives used to economically hedge equity settled share-based compensation plans (103)   53                    
Interest rate swap contract | Currency risk | Series US-7 Notes                          
Disclosure of detailed information about hedged items [line items]                          
Notional amount     127                    
Interest rate swap contract | Currency risk | Maturing in 2033 | Series US-8 Notes                          
Disclosure of detailed information about hedged items [line items]                          
Notional amount 1,138       $ 850                
Interest rate swap contract | Currency risk | Maturing in 2052 | Series US-7 Notes                          
Disclosure of detailed information about hedged items [line items]                          
Notional amount     954               $ 750    
Interest rate swap contract | Interest rate risk | Series M-53 Medium Term Notes Debentures                          
Disclosure of detailed information about hedged items [line items]                          
Notional amount, swaptions unexercised     500                    
Financial instruments designated as hedging instruments, at fair value 4   14                    
Interest rate swap contract | Interest rate risk | Series M-52 Medium Term Notes Debentures                          
Disclosure of detailed information about hedged items [line items]                          
Notional amount 125                        
Financial assets, at fair value 12                        
Interest rate swap contract | Interest rate risk | Series M-57 Medium Term Notes Debentures                          
Disclosure of detailed information about hedged items [line items]                          
Notional amount 375                        
Financial assets, at fair value 24                        
Interest rate swap contract | Interest rate risk | Maturing in 2027 | Series M-53 Medium Term Notes Debentures                          
Disclosure of detailed information about hedged items [line items]                          
Notional amount 125                        
Interest rate swap contract | Interest rate risk | Maturing in 2030 | Series M-52 Medium Term Notes Debentures                          
Disclosure of detailed information about hedged items [line items]                          
Notional amount 375                        
Interest rate swap contract | Interest rate risk | Maturing in 2032 | Series M-57 Medium Term Notes Debentures                          
Disclosure of detailed information about hedged items [line items]                          
Notional amount 125                        
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 15                        
Interest Rate Swaptions | Series M-53 Medium Term Notes Debentures                          
Disclosure of detailed information about hedged items [line items]                          
Notional amount 250                        
Interest Rate Swaptions | Interest rate risk | Series M-53 Medium Term Notes Debentures                          
Disclosure of detailed information about hedged items [line items]                          
Notional amount 425   1,000                    
Notional amount, swaptions exercised     500                    
Early debt redemption costs 4   (7)                    
Interest Rate Swaptions | Interest rate risk | Series M-52 Medium Term Notes Debentures                          
Disclosure of detailed information about hedged items [line items]                          
Notional amount 375                        
Early debt redemption costs 1                        
Interest Rate Swaptions | Interest rate risk | Series M-57 Medium Term Notes Debentures                          
Disclosure of detailed information about hedged items [line items]                          
Notional amount 125                        
Early debt redemption costs 2                        
Forward Starting Interest Rate Swap | Maturing in 2029 | Series M-62 Medium Term Notes Debentures                          
Disclosure of detailed information about hedged items [line items]                          
Notional amount 700                        
Forward Starting Interest Rate Swap | Interest rate risk | Series M-62 Medium Term Notes Debentures                          
Disclosure of detailed information about hedged items [line items]                          
Financial assets, at fair value 22                        
Forward Starting Interest Rate Swap | Interest rate risk | Series M-61 Medium Term Note Debentures                          
Disclosure of detailed information about hedged items [line items]                          
Financial assets, at fair value 48                        
Forward Starting Interest Rate Swap | Interest rate risk | Maturing In 2053 | Series M-59 Medium Term Notes Debentures                          
Disclosure of detailed information about hedged items [line items]                          
Notional amount 125                        
Forward Starting Interest Rate Swap | Interest rate risk | Maturing In 2053 | Series M-61 Medium Term Note Debentures                          
Disclosure of detailed information about hedged items [line items]                          
Notional amount 400                        
Amortizing Interest Rate Swap | Interest rate risk                          
Disclosure of detailed information about hedged items [line items]                          
FAIR VALUE 2                        
Amortizing Interest Rate Swap | Interest rate risk | Maturing in 2028                          
Disclosure of detailed information about hedged items [line items]                          
Notional amount $ 197                        
Currency Basis Rate Swap Contract | Interest rate risk                          
Disclosure of detailed information about hedged items [line items]                          
FAIR VALUE     33   $ 13                
Percentage of possible change in risk variable 0.10%       0.10%                
Net mark-to-market losses on derivatives used to economically hedge equity settled share-based compensation plans   $ 20   $ (33)                  
Reasonably possible change in risk variable impact on net earnings $ 11                        
Currency Basis Rate Swap Contract | Interest rate risk | Maturing in 2023                          
Disclosure of detailed information about hedged items [line items]                          
Notional amount     638                    
Currency Basis Rate Swap Contract | Interest rate risk | Maturing in 2024                          
Disclosure of detailed information about hedged items [line items]                          
Notional amount 644                        
Interest Rate Options | Interest rate risk | Dividend rate reset of preference shares                          
Disclosure of detailed information about hedged items [line items]                          
Financial instruments designated as hedging instruments, at fair value 0   1                    
Forward contract | Equity price risk                          
Disclosure of detailed information about hedged items [line items]                          
Financial instruments designated as hedging instruments, at fair value $ 162   $ 48