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Financial Instrument Risk Management - Debt Securities by Issuer and Industry Sector (Details) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of financial assets [line items] |  |
Financial assets | $ 143,061 | $ 137,691
Canadian federal government |  |
Disclosure of financial assets [line items] |  |
Financial assets | 5,576 | 5,198
Canadian federal government | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 3,830 | 3,366
Canadian federal government | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,746 | 1,832
Canadian provincial and municipal government |  |
Disclosure of financial assets [line items] |  |
Financial assets | 13,065 | 13,296
Canadian provincial and municipal government | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 11,866 | 12,158
Canadian provincial and municipal government | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,199 | 1,138
U.S. government and agency |  |
Disclosure of financial assets [line items] |  |
Financial assets | 2,907 | 2,049
U.S. government and agency | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,380 | 1,231
U.S. government and agency | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,527 | 818
Other foreign government |  |
Disclosure of financial assets [line items] |  |
Financial assets | 5,646 | 6,113
Other foreign government | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 4,929 | 5,361
Other foreign government | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 717 | 752
Government issued or guaranteed debt securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 27,194 | 26,656
Government issued or guaranteed debt securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 22,005 | 22,116
Government issued or guaranteed debt securities | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 5,189 | 4,540
Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 39,883 | 40,064
Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 34,870 | 34,170
Corporate Debt Securities | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 5,013 | 5,894
Corporate Debt Securities | Financials |  |
Disclosure of financial assets [line items] |  |
Financial assets | 9,860 | 9,561
Corporate Debt Securities | Financials | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 8,390 | 7,856
Corporate Debt Securities | Financials | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,470 | 1,705
Corporate Debt Securities | Utilities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 6,881 | 7,306
Corporate Debt Securities | Utilities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 6,353 | 6,756
Corporate Debt Securities | Utilities | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 528 | 550
Corporate Debt Securities | Industrials |  |
Disclosure of financial assets [line items] |  |
Financial assets | 4,643 | 4,797
Corporate Debt Securities | Industrials | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 4,053 | 4,090
Corporate Debt Securities | Industrials | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 590 | 707
Corporate Debt Securities | Energy |  |
Disclosure of financial assets [line items] |  |
Financial assets | 3,968 | 4,112
Corporate Debt Securities | Energy | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 3,628 | 3,657
Corporate Debt Securities | Energy | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 340 | 455
Corporate Debt Securities | Communication services(2) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 3,307 | 3,371
Corporate Debt Securities | Communication services(2) | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 2,826 | 2,826
Corporate Debt Securities | Communication services(2) | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 481 | 545
Corporate Debt Securities | Real estate |  |
Disclosure of financial assets [line items] |  |
Financial assets | 3,016 | 2,579
Corporate Debt Securities | Real estate | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 2,640 | 2,213
Corporate Debt Securities | Real estate | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 376 | 366
Corporate Debt Securities | Health care |  |
Disclosure of financial assets [line items] |  |
Financial assets | 2,033 | 1,579
Corporate Debt Securities | Health care | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,734 | 1,256
Corporate Debt Securities | Health care | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 299 | 323
Corporate Debt Securities | Consumer staples |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,882 | 2,271
Corporate Debt Securities | Consumer staples | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,625 | 1,920
Corporate Debt Securities | Consumer staples | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 257 | 351
Corporate Debt Securities | Consumer discretionary(2) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,581 | 1,692
Corporate Debt Securities | Consumer discretionary(2) | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,372 | 1,329
Corporate Debt Securities | Consumer discretionary(2) | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 209 | 363
Corporate Debt Securities | Materials |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,481 | 1,473
Corporate Debt Securities | Materials | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,225 | 1,211
Corporate Debt Securities | Materials | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 256 | 262
Corporate Debt Securities | Information technology(2) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,231 | 1,323
Corporate Debt Securities | Information technology(2) | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,024 | 1,056
Corporate Debt Securities | Information technology(2) | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 207 | 267
Asset-backed securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 7,366 | 5,899
Asset-backed securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 4,527 | 3,681
Asset-backed securities | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 2,839 | 2,218
Debt securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 74,443 | 72,619
Debt securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 61,402 | 59,967
Debt securities | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | $ 13,041 | $ 12,652

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