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Financial Instrument Risk Management - Debt Securities by Issuer and Industry Sector (Details) - CAD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of financial assets [line items] |  |
Financial assets | $ 173,735 | $ 168,785
Canadian federal government |  |
Disclosure of financial assets [line items] |  |
Financial assets | 7,101 | 6,489
Canadian federal government | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 4,798 | 4,560
Canadian federal government | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 2,303 | 1,929
Canadian provincial and municipal government |  |
Disclosure of financial assets [line items] |  |
Financial assets | 17,079 | 18,242
Canadian provincial and municipal government | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 15,930 | 16,909
Canadian provincial and municipal government | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,149 | 1,333
U.S. government and agency |  |
Disclosure of financial assets [line items] |  |
Financial assets | 2,413 | 2,475
U.S. government and agency | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,642 | 1,678
U.S. government and agency | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 771 | 797
Other foreign government |  |
Disclosure of financial assets [line items] |  |
Financial assets | 5,511 | 6,104
Other foreign government | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 4,754 | 5,281
Other foreign government | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 757 | 823
Total government issued or guaranteed debt securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 32,104 | 33,310
Total government issued or guaranteed debt securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 27,124 | 28,428
Total government issued or guaranteed debt securities | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 4,980 | 4,882
Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 47,566 | 46,974
Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 42,052 | 42,664
Corporate Debt Securities | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 5,514 | 4,310
Asset-backed securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 9,057 | 8,805
Asset-backed securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 6,822 | 6,742
Asset-backed securities | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 2,235 | 2,063
Debt securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 88,727 | 89,089
Debt securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 75,998 | 77,834
Debt securities | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 12,729 | 11,255
Financials | Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 11,948 | 11,856
Financials | Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 10,258 | 10,644
Financials | Corporate Debt Securities | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,690 | 1,212
Utilities | Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 8,192 | 8,243
Utilities | Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 7,414 | 7,561
Utilities | Corporate Debt Securities | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 778 | 682
Industrials | Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 6,596 | 6,226
Industrials | Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 5,791 | 5,659
Industrials | Corporate Debt Securities | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 805 | 567
Energy | Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 4,279 | 4,802
Energy | Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 3,992 | 4,452
Energy | Corporate Debt Securities | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 287 | 350
Communication services | Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 3,886 | 3,966
Communication services | Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 3,534 | 3,644
Communication services | Corporate Debt Securities | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 352 | 322
Real estate | Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 2,688 | 2,767
Real estate | Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 2,334 | 2,438
Real estate | Corporate Debt Securities | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 354 | 329
Health care | Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 2,427 | 2,172
Health care | Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 2,081 | 1,986
Health care | Corporate Debt Securities | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 346 | 186
Consumer staples | Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 2,278 | 2,051
Consumer staples | Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 2,047 | 1,893
Consumer staples | Corporate Debt Securities | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 231 | 158
Consumer discretionary | Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 2,120 | 1,771
Consumer discretionary | Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,814 | 1,606
Consumer discretionary | Corporate Debt Securities | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 306 | 165
Information technology | Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,635 | 1,495
Information technology | Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,426 | 1,308
Information technology | Corporate Debt Securities | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 209 | 187
Materials | Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,517 | 1,625
Materials | Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,361 | 1,473
Materials | Corporate Debt Securities | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | $ 156 | $ 152

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