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Financial Instrument Risk Management - Debt Securities by Issuer and Industry Sector (Details) - CAD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Disclosure of financial assets [line items] |  |
Notional amount | $ 165,557 | $ 173,735
Total government issued or guaranteed debt securities |  |
Disclosure of financial assets [line items] |  |
Notional amount | 25,437 | 32,104
Total government issued or guaranteed debt securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Notional amount | 21,190 | 27,124
Total government issued or guaranteed debt securities | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Notional amount | 4,247 | 4,980
Canadian federal government |  |
Disclosure of financial assets [line items] |  |
Notional amount | 5,611 | 7,101
Canadian federal government | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Notional amount | 3,881 | 4,798
Canadian federal government | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Notional amount | 1,730 | 2,303
Canadian provincial and municipal government |  |
Disclosure of financial assets [line items] |  |
Notional amount | 13,665 | 17,079
Canadian provincial and municipal government | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Notional amount | 12,638 | 15,930
Canadian provincial and municipal government | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Notional amount | 1,027 | 1,149
U.S. government and agency |  |
Disclosure of financial assets [line items] |  |
Notional amount | 1,537 | 2,413
U.S. government and agency | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Notional amount | 808 | 1,642
U.S. government and agency | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Notional amount | 729 | 771
Other foreign government |  |
Disclosure of financial assets [line items] |  |
Notional amount | 4,624 | 5,511
Other foreign government | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Notional amount | 3,863 | 4,754
Other foreign government | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Notional amount | 761 | 757
Corporate debt securities |  |
Disclosure of financial assets [line items] |  |
Notional amount | 41,310 | 47,566
Corporate debt securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Notional amount | 35,035 | 42,052
Corporate debt securities | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Notional amount | 6,275 | 5,514
Asset-backed securities |  |
Disclosure of financial assets [line items] |  |
Notional amount | 9,155 | 9,057
Asset-backed securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Notional amount | 6,532 | 6,822
Asset-backed securities | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Notional amount | 2,623 | 2,235
Debt securities |  |
Disclosure of financial assets [line items] |  |
Notional amount | 75,902 | 88,727
Debt securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Notional amount | 62,757 | 75,998
Debt securities | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Notional amount | 13,145 | 12,729
Financials | Corporate debt securities |  |
Disclosure of financial assets [line items] |  |
Notional amount | 11,355 | 11,948
Financials | Corporate debt securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Notional amount | 9,377 | 10,258
Financials | Corporate debt securities | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Notional amount | 1,978 | 1,690
Utilities | Corporate debt securities |  |
Disclosure of financial assets [line items] |  |
Notional amount | 6,676 | 8,192
Utilities | Corporate debt securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Notional amount | 5,979 | 7,414
Utilities | Corporate debt securities | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Notional amount | 697 | 778
Industrials | Corporate debt securities |  |
Disclosure of financial assets [line items] |  |
Notional amount | 5,575 | 6,596
Industrials | Corporate debt securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Notional amount | 4,762 | 5,791
Industrials | Corporate debt securities | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Notional amount | 813 | 805
Energy | Corporate debt securities |  |
Disclosure of financial assets [line items] |  |
Notional amount | 3,342 | 4,279
Energy | Corporate debt securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Notional amount | 3,069 | 3,992
Energy | Corporate debt securities | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Notional amount | 273 | 287
Communication services | Corporate debt securities |  |
Disclosure of financial assets [line items] |  |
Notional amount | 3,329 | 3,886
Communication services | Corporate debt securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Notional amount | 2,937 | 3,534
Communication services | Corporate debt securities | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Notional amount | 392 | 352
Real estate | Corporate debt securities |  |
Disclosure of financial assets [line items] |  |
Notional amount | 2,506 | 2,688
Real estate | Corporate debt securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Notional amount | 1,920 | 2,334
Real estate | Corporate debt securities | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Notional amount | 586 | 354
Health care | Corporate debt securities |  |
Disclosure of financial assets [line items] |  |
Notional amount | 2,034 | 2,427
Health care | Corporate debt securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Notional amount | 1,682 | 2,081
Health care | Corporate debt securities | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Notional amount | 352 | 346
Consumer staples | Corporate debt securities |  |
Disclosure of financial assets [line items] |  |
Notional amount | 1,978 | 2,278
Consumer staples | Corporate debt securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Notional amount | 1,677 | 2,047
Consumer staples | Corporate debt securities | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Notional amount | 301 | 231
Consumer discretionary | Corporate debt securities |  |
Disclosure of financial assets [line items] |  |
Notional amount | 1,836 | 2,120
Consumer discretionary | Corporate debt securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Notional amount | 1,395 | 1,814
Consumer discretionary | Corporate debt securities | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Notional amount | 441 | 306
Information technology | Corporate debt securities |  |
Disclosure of financial assets [line items] |  |
Notional amount | 1,384 | 1,635
Information technology | Corporate debt securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Notional amount | 1,130 | 1,426
Information technology | Corporate debt securities | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Notional amount | 254 | 209
Materials | Corporate debt securities |  |
Disclosure of financial assets [line items] |  |
Notional amount | 1,295 | 1,517
Materials | Corporate debt securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Notional amount | 1,107 | 1,361
Materials | Corporate debt securities | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Notional amount | $ 188 | $ 156

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