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Financial and capital management - Details on Outstanding Foreign Currency Forward Contracts and Cross Currency Basis Swaps (Details)
₱ in Millions, $ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2022
CAD ($)
Dec. 31, 2021
CAD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2022
PHP (₱)
Dec. 31, 2021
USD ($)
Disclosure of detailed information about hedged items [line items]          
Early debt redemption costs $ (18) $ (53)      
Net gains (losses) on change in fair value of derivatives (53) 278      
Preferred shares          
Disclosure of detailed information about hedged items [line items]          
Value of shares $ 3,870 4,003      
Currency risk          
Disclosure of detailed information about hedged items [line items]          
Percentage of possible change in risk variable 10.00%   10.00% 10.00%  
Reasonably possible change in 10% depreciation (appreciation) of the CAD dollar impact on other comprehensive income $ 4        
Currency risk | Maturing in 2023 | Cash flow hedges | Loans | Amount to receive          
Disclosure of detailed information about hedged items [line items]          
Notional amount     $ 1,178    
Currency risk | Maturing in 2023 | Cash flow hedges | Loans | Amount to pay          
Disclosure of detailed information about hedged items [line items]          
Notional amount 1,607        
Currency risk | Maturing in 2023 | Cash flow hedges | Commercial paper | Amount to receive          
Disclosure of detailed information about hedged items [line items]          
Notional amount     632    
Currency risk | Maturing in 2023 | Cash flow hedges | Commercial paper | Amount to pay          
Disclosure of detailed information about hedged items [line items]          
Notional amount 852        
Currency risk | Maturing in 2023 | Cash flow hedges | Anticipated Transactions | Amount to receive          
Disclosure of detailed information about hedged items [line items]          
Notional amount     796    
Currency risk | Maturing in 2023 | Cash flow hedges | Anticipated Transactions | Amount to receive | Purchased call options          
Disclosure of detailed information about hedged items [line items]          
Notional amount     156    
Currency risk | Maturing in 2023 | Cash flow hedges | Anticipated Transactions | Amount to pay          
Disclosure of detailed information about hedged items [line items]          
Notional amount 989        
Currency risk | Maturing in 2023 | Cash flow hedges | Anticipated Transactions | Amount to pay | Purchased call options          
Disclosure of detailed information about hedged items [line items]          
Notional amount 196        
Currency risk | Maturing in 2023 | Cash flow hedges | Anticipated Transactions | Amount to receive          
Disclosure of detailed information about hedged items [line items]          
Notional amount | ₱       ₱ 2,147  
Currency risk | Maturing in 2023 | Cash flow hedges | Anticipated Transactions | Amount to pay          
Disclosure of detailed information about hedged items [line items]          
Notional amount 50        
Currency risk | Maturing in 2023 | Economic | Anticipated Transactions | Amount to receive          
Disclosure of detailed information about hedged items [line items]          
Notional amount     225    
Currency risk | Maturing in 2023 | Economic | Anticipated Transactions | Amount to receive | Written put options          
Disclosure of detailed information about hedged items [line items]          
Notional amount     156    
Currency risk | Maturing in 2023 | Economic | Anticipated Transactions | Amount to pay          
Disclosure of detailed information about hedged items [line items]          
Notional amount 156        
Currency risk | Maturing in 2023 | Economic | Anticipated Transactions | Amount to pay | Written put options          
Disclosure of detailed information about hedged items [line items]          
Notional amount 196        
Currency risk | Maturing in 2024 | Cash flow hedges | Anticipated Transactions | Amount to receive          
Disclosure of detailed information about hedged items [line items]          
Notional amount     643    
Currency risk | Maturing in 2024 | Cash flow hedges | Anticipated Transactions | Amount to pay          
Disclosure of detailed information about hedged items [line items]          
Notional amount 810        
Currency risk | Maturing in 2024 | Economic | Anticipated Transactions | Amount to receive | Purchased call options          
Disclosure of detailed information about hedged items [line items]          
Notional amount 225   156    
Currency risk | Maturing in 2024 | Economic | Anticipated Transactions | Amount to receive | Written put options          
Disclosure of detailed information about hedged items [line items]          
Notional amount     120    
Currency risk | Maturing in 2024 | Economic | Anticipated Transactions | Amount to pay | Purchased call options          
Disclosure of detailed information about hedged items [line items]          
Notional amount 195   $ 156    
Currency risk | Maturing in 2024 | Economic | Anticipated Transactions | Amount to pay | Written put options          
Disclosure of detailed information about hedged items [line items]          
Notional amount $ 153        
Interest rate risk          
Disclosure of detailed information about hedged items [line items]          
Percentage of possible change in risk variable 1.00%   1.00% 1.00%  
Interest rate risk | Preferred shares          
Disclosure of detailed information about hedged items [line items]          
Value of shares   582      
Equity price risk          
Disclosure of detailed information about hedged items [line items]          
Net gains (losses) on change in fair value of derivatives $ (53) 278      
Percentage of possible change in risk variable 5.00%   5.00% 5.00%  
Reasonably possible change in risk variable impact on net earnings $ 33        
Top of range | Currency risk          
Disclosure of detailed information about hedged items [line items]          
Reasonably possible change in risk variable impact on net earnings 10        
Reasonably possible change in 10% depreciation (appreciation) of the CAD dollar impact on other comprehensive income 114        
Top of range | Interest rate risk          
Disclosure of detailed information about hedged items [line items]          
Reasonably possible change in risk variable impact on net earnings 23        
Bottom of range | Currency risk          
Disclosure of detailed information about hedged items [line items]          
Reasonably possible change in risk variable impact on net earnings (17)        
Reasonably possible change in 10% depreciation (appreciation) of the CAD dollar impact on other comprehensive income (105)        
Bottom of range | Interest rate risk          
Disclosure of detailed information about hedged items [line items]          
Reasonably possible change in risk variable impact on net earnings (24)        
Interest rate swap contract | Currency risk | Fair value hedges          
Disclosure of detailed information about hedged items [line items]          
Notional amount 954 4,511 $ 750   $ 3,500
Interest rate swap contract | Interest rate risk          
Disclosure of detailed information about hedged items [line items]          
Notional amount 500 748     $ 600
Early debt redemption costs 7        
Financial instruments designated as hedging instruments, at fair value 14        
Interest rate swap contract | Interest rate risk | Series M-53 MTN debentures          
Disclosure of detailed information about hedged items [line items]          
Notional amount 1,000        
Proceeds from sale of financial assets 9        
Interest rate swap contract | Interest rate risk | Maturing in 2023          
Disclosure of detailed information about hedged items [line items]          
Notional amount 638        
Financial liabilities, at fair value 33        
Interest rate swap contract | Interest rate risk | Maturing in 2027 | Series M-53 MTN debentures          
Disclosure of detailed information about hedged items [line items]          
Notional amount 500        
Currency Basis Rate Swap Contract          
Disclosure of detailed information about hedged items [line items]          
Reasonably possible change in risk variable impact on net earnings $ 9        
Currency Basis Rate Swap Contract | Cross currency basis swap rate risk          
Disclosure of detailed information about hedged items [line items]          
Percentage of possible change in risk variable 0.10%   0.10% 0.10%  
Forward contract | Equity price risk          
Disclosure of detailed information about hedged items [line items]          
Financial instruments designated as hedging instruments, at fair value $ 48 130      
Interest Rate Options | Interest rate risk          
Disclosure of detailed information about hedged items [line items]          
Net gains (losses) on change in fair value of derivatives 1 15      
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 $ 1 2      
Swap contract | Currency risk | Fair value hedges          
Disclosure of detailed information about hedged items [line items]          
Notional amount   $ 127