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Financial Instrument Risk Management - Notional Amount of Derivative Financial Instruments (Details)
 12 Months Ended
Dec. 31, 2023
CAD ($)
$ / shares
Dec. 31, 2022
CAD ($)
$ / shares
Disclosure of detailed information about financial instruments [line items]    
Average exchange rates during the reporting periods (in USD per share) | $ / shares 1.35 1.30
Average price of hedging instrument 66 65
Interest rate swap contracts | Total designated as hedging instrument    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount $ 0 $ 0
Average fixed rate 0.04  
Foreign currency swap contracts | Total designated as hedging instrument    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount $ 868,000,000 1,199,000,000
Equity price risk | Total designated as hedging instrument    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount 168,000,000 152,000,000
Derivative investments    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount $ 70,421,000,000 $ 69,768,000,000
Average exchange rates during the reporting periods (in USD per share) 1.56 1.34
Derivative investments | Total designated as hedging instrument    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount $ 1,036,000,000 $ 1,351,000,000
Derivative investments | Derivative instruments not designated as hedges    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount 69,385,000,000 68,417,000,000
Under 1 Year | Interest rate swap contracts | Total designated as hedging instrument    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount 0 0
Under 1 Year | Foreign currency swap contracts | Total designated as hedging instrument    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount 828,000,000 1,199,000,000
Under 1 Year | Equity price risk | Total designated as hedging instrument    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount 54,000,000 52,000,000
Under 1 Year | Derivative investments    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount 28,416,000,000 27,849,000,000
Under 1 Year | Derivative investments | Total designated as hedging instrument    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount 882,000,000 1,251,000,000
Under 1 Year | Derivative investments | Derivative instruments not designated as hedges    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount 27,534,000,000 26,598,000,000
1 to 5 Years | Interest rate swap contracts | Total designated as hedging instrument    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount 0 0
1 to 5 Years | Foreign currency swap contracts | Total designated as hedging instrument    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount 40,000,000 0
1 to 5 Years | Equity price risk | Total designated as hedging instrument    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount 114,000,000 100,000,000
1 to 5 Years | Derivative investments    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount 11,279,000,000 10,295,000,000
1 to 5 Years | Derivative investments | Total designated as hedging instrument    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount 154,000,000 100,000,000
1 to 5 Years | Derivative investments | Derivative instruments not designated as hedges    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount 11,125,000,000 10,195,000,000
Over 5 Years | Interest rate swap contracts | Total designated as hedging instrument    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount 0 0
Over 5 Years | Foreign currency swap contracts | Total designated as hedging instrument    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount 0 0
Over 5 Years | Equity price risk | Total designated as hedging instrument    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount 0 0
Over 5 Years | Derivative investments    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount 30,726,000,000 31,624,000,000
Over 5 Years | Derivative investments | Total designated as hedging instrument    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount 0 0
Over 5 Years | Derivative investments | Derivative instruments not designated as hedges    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount $ 30,726,000,000 $ 31,624,000,000