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Financial Instrument Risk Management - Debt Securities by Issuer and Industry Sector (Details) - CAD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of financial assets [line items] |  |
Financial assets | $ 152,785 | $ 143,061
Canadian federal government |  |
Disclosure of financial assets [line items] |  |
Financial assets | 6,446 | 5,576
Canadian federal government | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 3,890 | 3,830
Canadian federal government | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 2,556 | 1,746
Canadian provincial and municipal government |  |
Disclosure of financial assets [line items] |  |
Financial assets | 14,965 | 13,065
Canadian provincial and municipal government | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 13,826 | 11,866
Canadian provincial and municipal government | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,139 | 1,199
U.S. government and agency |  |
Disclosure of financial assets [line items] |  |
Financial assets | 3,111 | 2,907
U.S. government and agency | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,748 | 1,380
U.S. government and agency | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,363 | 1,527
Other foreign government |  |
Disclosure of financial assets [line items] |  |
Financial assets | 5,917 | 5,646
Other foreign government | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 5,181 | 4,929
Other foreign government | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 736 | 717
Government issued or guaranteed debt securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 30,439 | 27,194
Government issued or guaranteed debt securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 24,645 | 22,005
Government issued or guaranteed debt securities | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 5,794 | 5,189
Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 42,765 | 39,883
Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 37,681 | 34,870
Corporate Debt Securities | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 5,084 | 5,013
Asset-backed securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 8,402 | 7,366
Asset-backed securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 5,568 | 4,527
Asset-backed securities | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 2,834 | 2,839
Debt securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 81,606 | 74,443
Debt securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 67,894 | 61,402
Debt securities | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 13,712 | 13,041
Financials | Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 10,926 | 9,860
Financials | Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 9,341 | 8,390
Financials | Corporate Debt Securities | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,585 | 1,470
Utilities | Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 7,258 | 6,881
Utilities | Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 6,693 | 6,353
Utilities | Corporate Debt Securities | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 565 | 528
Industrials | Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 5,429 | 4,643
Industrials | Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 4,800 | 4,053
Industrials | Corporate Debt Securities | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 629 | 590
Energy | Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 4,232 | 3,968
Energy | Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 3,867 | 3,628
Energy | Corporate Debt Securities | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 365 | 340
Communication services | Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 3,546 | 3,307
Communication services | Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 3,075 | 2,826
Communication services | Corporate Debt Securities | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 471 | 481
Real estate | Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 2,963 | 3,016
Real estate | Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 2,595 | 2,640
Real estate | Corporate Debt Securities | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 368 | 376
Health care | Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 2,122 | 2,033
Health care | Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,886 | 1,734
Health care | Corporate Debt Securities | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 236 | 299
Consumer staples | Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,924 | 1,882
Consumer staples | Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,703 | 1,625
Consumer staples | Corporate Debt Securities | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 221 | 257
Materials | Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,543 | 1,481
Materials | Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,331 | 1,225
Materials | Corporate Debt Securities | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 212 | 256
Consumer discretionary | Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,487 | 1,581
Consumer discretionary | Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,268 | 1,372
Consumer discretionary | Corporate Debt Securities | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 219 | 209
Information technology | Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,335 | 1,231
Information technology | Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,122 | 1,024
Information technology | Corporate Debt Securities | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | $ 213 | $ 207

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