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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, 2021
CAD ($)
Dec. 31, 2021
CAD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
PHP (₱)
Jun. 30, 2021
USD ($)
Disclosure of detailed information about hedged items [line items]            
Net gains (losses) on change in fair value of derivatives   $ 278 $ (51)      
Preferred shares            
Disclosure of detailed information about hedged items [line items]            
Value of shares   $ 4,003 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 2022 | Cash flow hedges | Commercial paper | Amount to receive            
Disclosure of detailed information about hedged items [line items]            
Notional amount       $ 561    
Currency risk | Maturing in 2022 | Cash flow hedges | Commercial paper | Amount to pay            
Disclosure of detailed information about hedged items [line items]            
Notional amount   721        
Currency risk | Maturing in 2022 | Cash flow hedges | Anticipated Transactions | Amount to receive            
Disclosure of detailed information about hedged items [line items]            
Notional amount | ₱         ₱ 2,270  
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       212    
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       212    
Currency risk | Maturing in 2022 | Cash flow hedges | Anticipated Transactions | Amount to pay            
Disclosure of detailed information about hedged items [line items]            
Notional amount   58        
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   275        
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   272        
Currency risk | Maturing in 2022 | Cash flow hedges | Anticipated Transactions | Amount to receive            
Disclosure of detailed information about hedged items [line items]            
Notional amount       568    
Currency risk | Maturing in 2022 | Cash flow hedges | Anticipated Transactions | Amount to pay            
Disclosure of detailed information about hedged items [line items]            
Notional amount   723        
Currency risk | Maturing in 2022 | Economic | Anticipated Transactions | Amount to receive            
Disclosure of detailed information about hedged items [line items]            
Notional amount       40    
Currency risk | Maturing in 2022 | Economic | Anticipated Transactions | Amount to receive | Purchased call options            
Disclosure of detailed information about hedged items [line items]            
Notional amount   190   150    
Currency risk | Maturing in 2022 | Economic | Anticipated Transactions | Amount to receive | Written put options            
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   50        
Currency risk | Maturing in 2022 | Economic | Anticipated Transactions | Amount to pay | Purchased call options            
Disclosure of detailed information about hedged items [line items]            
Notional amount   178   150    
Currency risk | Maturing in 2022 | Economic | Anticipated Transactions | Amount to pay | Written put options            
Disclosure of detailed information about hedged items [line items]            
Notional amount   123        
Currency risk | Maturing in 2023 | Cash flow hedges | Anticipated Transactions | Amount to receive            
Disclosure of detailed information about hedged items [line items]            
Notional amount       550    
Currency risk | Maturing in 2023 | Cash flow hedges | Anticipated Transactions | Amount to pay            
Disclosure of detailed information about hedged items [line items]            
Notional amount   678        
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       $ 240    
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   $ 290        
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   $ (278) 51      
Percentage of possible change in risk variable   5.00%   5.00% 5.00%  
Reasonably possible change in risk variable impact on net earnings   $ 43        
Commodity price risk            
Disclosure of detailed information about hedged items [line items]            
Net gains (losses) on change in fair value of derivatives   6 3      
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   241        
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   3        
Reasonably possible change in risk variable impact on other comprehensive income   18        
Bottom of range | Currency risk            
Disclosure of detailed information about hedged items [line items]            
Reasonably possible change in risk variable impact on net earnings   (20)        
Reasonably possible change in 10% depreciation (appreciation) of the CAD dollar impact on other comprehensive income   (221)        
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   (4)        
Reasonably possible change in risk variable impact on other comprehensive income   (25)        
Interest rate swap contract | Currency risk | Fair value hedges            
Disclosure of detailed information about hedged items [line items]            
Notional amount   4,511   $ 3,500    
Interest rate swap contract | Interest rate risk            
Disclosure of detailed information about hedged items [line items]            
Notional amount   748   $ 600    
Forward contract | Currency risk | Fair value hedges            
Disclosure of detailed information about hedged items [line items]            
Notional amount $ 2,039         $ 1,453
Net gains (losses) on change in fair value of derivatives $ (14)          
Forward contract | Interest rate risk            
Disclosure of detailed information about hedged items [line items]            
Notional amount   127        
Forward contract | Equity price risk | Purchase Cost of Fuel            
Disclosure of detailed information about hedged items [line items]            
Financial instruments designated as hedging instruments, at fair value   130 82      
Currency swap contract | Interest rate risk            
Disclosure of detailed information about hedged items [line items]            
Notional amount   127        
Net gains (losses) on change in fair value of derivatives   1        
Currency swap contract | Interest rate risk | Net asset value            
Disclosure of detailed information about hedged items [line items]            
Financial instruments designated as hedging instruments, at fair value   1        
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   15 6      
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   $ 2 $ 6