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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)

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