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Financial Instrument Risk Management - Notional Amount of Derivative Financial Instruments (Details)
 12 Months Ended
Dec. 31, 2024
CAD ($)
$ / shares
Dec. 31, 2023
CAD ($)
$ / shares
Disclosure of detailed information about financial instruments [line items]    
Total notional amount   $ 9,159,000,000
Average exchange rates during the reporting periods (in USD per share) | $ / shares 1.37 1.35
Average price of hedging instrument 69 66
Interest rate swap contracts | Total designated as hedging instrument    
Disclosure of detailed information about financial instruments [line items]    
Average fixed rate 0.04 0.04
Foreign currency swap contracts | Total designated as hedging instrument    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount $ 902,000,000 $ 868,000,000
Equity price risk | Total designated as hedging instrument    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount 188,000,000 168,000,000
Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount $ 74,954,000,000 $ 70,421,000,000
Average exchange rates during the reporting periods (in USD per share) 1.42 1.56
Derivatives | Total designated as hedging instrument    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount $ 1,090,000,000 $ 1,036,000,000
Derivatives | Derivative investments    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount 73,864,000,000 69,385,000,000
Under 1 Year | Foreign currency swap contracts | Total designated as hedging instrument    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount 888,000,000 828,000,000
Under 1 Year | Equity price risk | Total designated as hedging instrument    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount 60,000,000 54,000,000
Under 1 Year | Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount 29,307,000,000 28,416,000,000
Under 1 Year | Derivatives | Total designated as hedging instrument    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount 948,000,000 882,000,000
Under 1 Year | Derivatives | Derivative investments    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount 28,359,000,000 27,534,000,000
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 0 40,000,000
1 to 5 Years | Equity price risk | Total designated as hedging instrument    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount 128,000,000 114,000,000
1 to 5 Years | Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount 13,379,000,000 11,279,000,000
1 to 5 Years | Derivatives | Total designated as hedging instrument    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount 128,000,000 154,000,000
1 to 5 Years | Derivatives | Derivative investments    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount 13,251,000,000 11,125,000,000
Over 5 Years | Foreign currency swap contracts | Total designated as hedging instrument    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount 14,000,000 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 | Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount 32,268,000,000 30,726,000,000
Over 5 Years | Derivatives | Total designated as hedging instrument    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount 14,000,000 0
Over 5 Years | Derivatives | Derivative investments    
Disclosure of detailed information about financial instruments [line items]    
Total notional amount $ 32,254,000,000 $ 30,726,000,000