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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, 2018
Dec. 31, 2017
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers $ 8,566 $ 8,343
Real estate management services [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 348 344
Asia [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 840 848
Asia [member] | Real estate management services [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 31 22
Canada [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 1,212 1,233
Canada [member] | Real estate management services [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 160 161
U.S. [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 1,302 1,368
U.S. [member] | Real estate management services [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 147 156
Other revenue [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 8,218 7,999
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 3,567 3,222
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 3,036 3,075
Other revenue [member] | Distribution fees and other [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 1,615 1,702
Other revenue [member] | Asia [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 809 826
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 328 351
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 226 206
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 255 269
Other revenue [member] | Canada [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 1,052 1,072
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 149 137
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 854 871
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 49 64
Other revenue [member] | U.S. [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 1,155 1,212
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 521 569
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 17 17
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 617 626
Global wealth and asset management [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 5,468 5,160
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 5,468 5,160
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 2,805 2,397
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 1,939 1,978
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 724 785
Corporate and other [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers (256) (266)
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 10 5
Corporate and other [member] | Other revenue [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers (266) (271)
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 (236) (232)
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   3
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 $ (30) $ (42)