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Revenue from Service Contracts - Revenue from Service Contracts by Service Lines and Reporting Segments (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers $ 7,588 $ 6,746
Asia, Canada, U.S., and Corporate and Other    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 149 37
Global WAM    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 7,439 6,709
Real estate management services included in net investment income    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 317 303
Real estate management services included in net investment income | Asia, Canada, U.S., and Corporate and Other    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 317 303
Real estate management services included in net investment income | Global WAM    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 0 0
Other revenue    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 7,293 6,617
Other revenue | Asia, Canada, U.S., and Corporate and Other    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers (145) (89)
Other revenue | Global WAM    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 7,438 6,706
Other revenue | Investment management and other related fees    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 3,123 2,886
Other revenue | Investment management and other related fees | Asia, Canada, U.S., and Corporate and Other    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers (489) (412)
Other revenue | Investment management and other related fees | Global WAM    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 3,612 3,298
Other revenue | Transaction processing, administration and service fees    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 3,206 2,835
Other revenue | Transaction processing, administration and service fees | Asia, Canada, U.S., and Corporate and Other    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 298 269
Other revenue | Transaction processing, administration and service fees | Global WAM    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 2,908 2,566
Other revenue | Distribution fees and other    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 964 896
Other revenue | Distribution fees and other | Asia, Canada, U.S., and Corporate and Other    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 46 54
Other revenue | Distribution fees and other | Global WAM    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 918 842
Revenue from non-service lines    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 295 129
Revenue from non-service lines | Asia, Canada, U.S., and Corporate and Other    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 294 126
Revenue from non-service lines | Global WAM    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers $ 1 $ 3