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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