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Financial Instrument Risk Management - Debt Securities by Issuer and Industry Sector (Details) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of financial assets [line items] |  |
Financial assets | $ 168,785 | $ 152,785
Canadian federal government |  |
Disclosure of financial assets [line items] |  |
Financial assets | 6,489 | 6,446
Canadian federal government | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 4,560 | 3,890
Canadian federal government | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,929 | 2,556
Canadian provincial and municipal government |  |
Disclosure of financial assets [line items] |  |
Financial assets | 18,242 | 14,965
Canadian provincial and municipal government | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 16,909 | 13,826
Canadian provincial and municipal government | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,333 | 1,139
U.S. government and agency |  |
Disclosure of financial assets [line items] |  |
Financial assets | 2,475 | 3,111
U.S. government and agency | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,678 | 1,748
U.S. government and agency | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 797 | 1,363
Other foreign government |  |
Disclosure of financial assets [line items] |  |
Financial assets | 6,104 | 5,917
Other foreign government | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 5,281 | 5,181
Other foreign government | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 823 | 736
Government issued or guaranteed debt securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 33,310 | 30,439
Government issued or guaranteed debt securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 28,428 | 24,645
Government issued or guaranteed debt securities | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 4,882 | 5,794
Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 46,974 | 42,765
Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 42,664 | 37,681
Corporate Debt Securities | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 4,310 | 5,084
Asset-backed securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 8,805 | 8,402
Asset-backed securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 6,742 | 5,568
Asset-backed securities | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 2,063 | 2,834
Debt securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 89,089 | 81,606
Debt securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 77,834 | 67,894
Debt securities | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 11,255 | 13,712
Financials | Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 11,856 | 10,926
Financials | Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 10,644 | 9,341
Financials | Corporate Debt Securities | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,212 | 1,585
Utilities | Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 8,243 | 7,258
Utilities | Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 7,561 | 6,693
Utilities | Corporate Debt Securities | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 682 | 565
Industrials | Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 6,226 | 5,429
Industrials | Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 5,659 | 4,800
Industrials | Corporate Debt Securities | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 567 | 629
Energy | Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 4,802 | 4,232
Energy | Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 4,452 | 3,867
Energy | Corporate Debt Securities | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 350 | 365
Communication services | Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 3,966 | 3,546
Communication services | Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 3,644 | 3,075
Communication services | Corporate Debt Securities | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 322 | 471
Real estate | Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 2,767 | 2,963
Real estate | Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 2,438 | 2,595
Real estate | Corporate Debt Securities | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 329 | 368
Health care | Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 2,172 | 2,122
Health care | Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,986 | 1,886
Health care | Corporate Debt Securities | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 186 | 236
Consumer staples | Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 2,051 | 1,924
Consumer staples | Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,893 | 1,703
Consumer staples | Corporate Debt Securities | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 158 | 221
Consumer discretionary | Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,771 | 1,487
Consumer discretionary | Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,606 | 1,268
Consumer discretionary | Corporate Debt Securities | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 165 | 219
Materials | Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,625 | 1,543
Materials | Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,473 | 1,331
Materials | Corporate Debt Securities | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | 152 | 212
Information technology | Corporate Debt Securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,495 | 1,335
Information technology | Corporate Debt Securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,308 | 1,122
Information technology | Corporate Debt Securities | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Financial assets | $ 187 | $ 213

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