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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
 6 Months Ended 12 Months Ended
Jun. 30, 2020
CAD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
PHP (₱)
Sep. 30, 2020
CAD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Disclosure of detailed information about hedged items [line items]                
Net gains (losses) on change in fair value of derivatives   $ (51) $ 138          
Preferred shares                
Disclosure of detailed information about hedged items [line items]                
Value of shares   4,003 4,004          
Credit Facility                
Disclosure of detailed information about hedged items [line items]                
Notional amount $ 2,035           $ 1,450  
Interest rate risk                
Disclosure of detailed information about hedged items [line items]                
Net gains (losses) on change in fair value of derivatives   $ 6            
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   $ (51) 138          
Percentage of possible change in risk variable   5.00%   5.00% 5.00%      
Reasonably possible change in risk variable impact on net earnings   $ 39            
Currency risk                
Disclosure of detailed information about hedged items [line items]                
Net gains (losses) on change in fair value of derivatives (14)              
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 2021 | Cash flow hedges | Commercial Paper | Amount to receive                
Disclosure of detailed information about hedged items [line items]                
Notional amount       $ 274        
Currency risk | Maturing in 2021 | Cash flow hedges | Commercial Paper | Amount to pay                
Disclosure of detailed information about hedged items [line items]                
Notional amount   349            
Currency risk | Maturing in 2021 | Cash flow hedges | Anticipated Transactions | Amount to receive                
Disclosure of detailed information about hedged items [line items]                
Notional amount       675 ₱ 2,174      
Currency risk | Maturing in 2021 | Cash flow hedges | Anticipated Transactions | Amount to pay                
Disclosure of detailed information about hedged items [line items]                
Notional amount   885            
Currency risk | Maturing in 2021 | Cash flow hedges | Anticipated Transactions | Amount to pay                
Disclosure of detailed information about hedged items [line items]                
Notional amount   59            
Currency risk | Maturing in 2021 | Economic | Anticipated Transactions | Amount to receive                
Disclosure of detailed information about hedged items [line items]                
Notional amount       130        
Currency risk | Maturing in 2021 | Economic | Anticipated Transactions | Amount to receive | Purchased call options                
Disclosure of detailed information about hedged items [line items]                
Notional amount   17   12        
Currency risk | Maturing in 2021 | 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 2021 | Economic | Anticipated Transactions | Amount to pay                
Disclosure of detailed information about hedged items [line items]                
Notional amount   180            
Currency risk | Maturing in 2021 | Economic | Anticipated Transactions | Amount to pay | Purchased call options                
Disclosure of detailed information about hedged items [line items]                
Notional amount   17   12        
Currency risk | Maturing in 2021 | Economic | Anticipated Transactions | Amount to pay | Written put options                
Disclosure of detailed information about hedged items [line items]                
Notional amount   154            
Currency risk | Maturing in 2022 | Cash flow hedges | Anticipated Transactions | Amount to receive                
Disclosure of detailed information about hedged items [line items]                
Notional amount       479        
Currency risk | Maturing in 2022 | Cash flow hedges | Anticipated Transactions | Amount to receive | Purchased call options                
Disclosure of detailed information about hedged items [line items]                
Notional amount       231        
Currency risk | Maturing in 2022 | Cash flow hedges | Anticipated Transactions | Amount to receive | Written put options                
Disclosure of detailed information about hedged items [line items]                
Notional amount       231        
Currency risk | Maturing in 2022 | Cash flow hedges | Anticipated Transactions | Amount to pay                
Disclosure of detailed information about hedged items [line items]                
Notional amount   614            
Currency risk | Maturing in 2022 | Cash flow hedges | Anticipated Transactions | Amount to pay | Purchased call options                
Disclosure of detailed information about hedged items [line items]                
Notional amount   299            
Currency risk | Maturing in 2022 | Cash flow hedges | Anticipated Transactions | Amount to pay | Written put options                
Disclosure of detailed information about hedged items [line items]                
Notional amount   295            
Currency risk | Maturing in 2022 | Economic | Anticipated Transactions | Amount to receive                
Disclosure of detailed information about hedged items [line items]                
Notional amount       $ 99        
Currency risk | Maturing in 2022 | Economic | Anticipated Transactions | Amount to pay                
Disclosure of detailed information about hedged items [line items]                
Notional amount   123            
Commodity price risk                
Disclosure of detailed information about hedged items [line items]                
Net gains (losses) on change in fair value of derivatives   $ 3            
Percentage of possible change in risk variable   25.00%   25.00% 25.00%      
Reasonably possible change in risk variable impact on net earnings   $ 3            
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   20            
Top of range | Currency risk                
Disclosure of detailed information about hedged items [line items]                
Reasonably possible change in risk variable impact on net earnings   7            
Reasonably possible change in 10% depreciation (appreciation) of the CAD dollar impact on other comprehensive income   245            
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   (26)            
Bottom of range | Currency risk                
Disclosure of detailed information about hedged items [line items]                
Reasonably possible change in risk variable impact on net earnings   (19)            
Reasonably possible change in 10% depreciation (appreciation) of the CAD dollar impact on other comprehensive income   (215)            
Interest rate swap contract | Interest rate risk                
Disclosure of detailed information about hedged items [line items]                
Net gains (losses) on change in fair value of derivatives   (9) 8          
Interest rate swap contract | Interest rate risk | Fair value hedges                
Disclosure of detailed information about hedged items [line items]                
Notional amount     2,301         $ 1,750
Interest rate swap contract | Currency risk | Fair value hedges                
Disclosure of detailed information about hedged items [line items]                
Notional amount $ 2,039           $ 1,453 $ 275
Forward contract | Interest rate risk | Settlement of share-based compensation plans | Net asset value                
Disclosure of detailed information about hedged items [line items]                
Financial instruments designated as hedging instruments, at fair value   6            
Forward contract | Equity price risk | Settlement of share-based compensation plans                
Disclosure of detailed information about hedged items [line items]                
Financial instruments designated as hedging instruments, at fair value   82 $ 40          
Swap contract | Commodity price risk | Settlement of share-based compensation plans | Net asset value                
Disclosure of detailed information about hedged items [line items]                
Financial instruments designated as hedging instruments, at fair value   $ 3