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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, 2021
Dec. 31, 2020
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers $ 11,132 $ 10,591
Real estate management services [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 298 332
Asia [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 1,696 1,346
Asia [member] | Real estate management services [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 37 37
Canada [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 1,336 1,013
Canada [member] | Real estate management services [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 126 144
U.S. [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 1,824 2,711
U.S. [member] | Real estate management services [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 128 143
Other revenue [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 8,701 7,729
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 3,897 3,508
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 3,723 3,285
Other revenue [member] | Distribution fees and other [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 1,081 936
Other revenue [member] | Asia [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 755 649
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 217 223
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 287 239
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 251 187
Other revenue [member] | Canada [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 1,168 1,032
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 230 202
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 918 814
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 20 16
Other revenue [member] | U.S. [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 576 596
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 499 514
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 12 15
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 65 67
Revenue from non-service lines [Member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 2,431 2,862
Revenue from non-service lines [Member] | Asia [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 941 697
Revenue from non-service lines [Member] | Canada [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 168 (19)
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 1,248 2,115
Global wealth and asset management [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 6,513 5,710
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 6,514 5,703
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 3,198 2,770
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 2,517 2,215
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 799 718
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 (1) 7
Corporate and other [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers (237) (189)
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 7 8
Corporate and other [member] | Other revenue [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers (312) (251)
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 (247) (201)
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 (11) 2
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 (54) (52)
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 $ 75 $ 62