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Revenue from Service Contracts - Summary of Revenue from Service Contracts by Service Lines and Reporting Segments (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers $ 9,164 $ 11,132
Real estate management services [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 305 298
Asia [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 1,458 1,696
Asia [member] | Real estate management services [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 35 37
Canada [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 1,426 1,336
Canada [member] | Real estate management services [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 136 126
U.S. [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 458 1,824
U.S. [member] | Real estate management services [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 126 128
Other revenue [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 8,415 8,701
Other revenue [member] | Investment management and other related fees [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 3,750 3,897
Other revenue [member] | Transaction processing, administration, and service fees [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 3,579 3,723
Other revenue [member] | Distribution fees and other [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 1,086 1,081
Other revenue [member] | Asia [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 669 755
Other revenue [member] | Asia [member] | Investment management and other related fees [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 234 217
Other revenue [member] | Asia [member] | Transaction processing, administration, and service fees [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 292 287
Other revenue [member] | Asia [member] | Distribution fees and other [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 143 251
Other revenue [member] | Canada [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 1,151 1,168
Other revenue [member] | Canada [member] | Investment management and other related fees [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 242 230
Other revenue [member] | Canada [member] | Transaction processing, administration, and service fees [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 866 918
Other revenue [member] | Canada [member] | Distribution fees and other [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 43 20
Other revenue [member] | U.S. [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 534 576
Other revenue [member] | U.S. [member] | Investment management and other related fees [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 445 499
Other revenue [member] | U.S. [member] | Transaction processing, administration, and service fees [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 13 12
Other revenue [member] | U.S. [member] | Distribution fees and other [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 76 65
Revenue from non-service lines [Member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 749 2,431
Revenue from non-service lines [Member] | Asia [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 789 941
Revenue from non-service lines [Member] | Canada [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 275 168
Revenue from non-service lines [Member] | U.S. [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers (76) 1,248
Global wealth and asset management [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 6,350 6,513
Global wealth and asset management [member] | Real estate management services [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 0  
Global wealth and asset management [member] | Other revenue [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 6,363 6,514
Global wealth and asset management [member] | Other revenue [member] | Investment management and other related fees [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 3,079 3,198
Global wealth and asset management [member] | Other revenue [member] | Transaction processing, administration, and service fees [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 2,416 2,517
Global wealth and asset management [member] | Other revenue [member] | Distribution fees and other [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 868 799
Global wealth and asset management [member] | Revenue from non-service lines [Member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers (13) (1)
Corporate and other [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers (528) (237)
Corporate and other [member] | Real estate management services [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 8 7
Corporate and other [member] | Other revenue [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers (302) (312)
Corporate and other [member] | Other revenue [member] | Investment management and other related fees [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers (250) (247)
Corporate and other [member] | Other revenue [member] | Transaction processing, administration, and service fees [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers (8) (11)
Corporate and other [member] | Other revenue [member] | Distribution fees and other [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers (44) (54)
Corporate and other [member] | Revenue from non-service lines [Member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers $ (226) $ 75