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Financial Instrument Risk Management - Notional Amount of Derivative Financial Instruments (Details) - CAD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]
Financial assets	$ 152,785	$ 143,061
Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	62,131	59,198
Swap contracts
Disclosure of detailed information about financial instruments [line items]
Financial assets	1,227	1,356
Over-the-counter interest rate contracts | Forward contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	50	0
Over-the-counter interest rate contracts | Interest rate swap contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	19,607	21,292
Over-the-counter interest rate contracts | Options purchased | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	6,746	7,833
Over-the-counter interest rate contracts | Options written | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	831	1,350
Over-the-counter foreign exchange contracts | Forward contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	9,426	6,544
Over-the-counter foreign exchange contracts | Foreign currency swap contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	16,956	14,193
Over-the-counter other contracts | Forward contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	304	285
Over-the-counter other contracts | Swap contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	179	113
Over-the-counter other contracts | Options purchased | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	1,164	0
Over-the-counter other contracts | Credit derivatives | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	1,227	1,356
Exchange-traded interest rate contracts | Futures contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	2,917	3,669
Exchange-traded equity contracts | Options purchased | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	200	186
Exchange-traded equity contracts | Options written | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	17	0
Exchange-traded equity contracts | Futures contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	2,507	2,377
Under 1 Year | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	16,540	16,308
Under 1 Year | Over-the-counter interest rate contracts | Forward contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	50	0
Under 1 Year | Over-the-counter interest rate contracts | Interest rate swap contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	1,906	1,101
Under 1 Year | Over-the-counter interest rate contracts | Options purchased | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	617	1,198
Under 1 Year | Over-the-counter interest rate contracts | Options written | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	357	477
Under 1 Year | Over-the-counter foreign exchange contracts | Forward contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	5,289	6,529
Under 1 Year | Over-the-counter foreign exchange contracts | Foreign currency swap contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	867	532
Under 1 Year | Over-the-counter other contracts | Forward contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	128	127
Under 1 Year | Over-the-counter other contracts | Swap contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	178	112
Under 1 Year | Over-the-counter other contracts | Options purchased | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	1,164	0
Under 1 Year | Over-the-counter other contracts | Credit derivatives | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	343	0
Under 1 Year | Exchange-traded interest rate contracts | Futures contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	2,917	3,669
Under 1 Year | Exchange-traded equity contracts | Options purchased | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	200	186
Under 1 Year | Exchange-traded equity contracts | Options written | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	17	0
Under 1 Year | Exchange-traded equity contracts | Futures contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	2,507	2,377
1 to 5 Years | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	15,720	13,006
1 to 5 Years | Over-the-counter interest rate contracts | Forward contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	0	0
1 to 5 Years | Over-the-counter interest rate contracts | Interest rate swap contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	3,052	3,506
1 to 5 Years | Over-the-counter interest rate contracts | Options purchased | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	3,279	2,898
1 to 5 Years | Over-the-counter interest rate contracts | Options written | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	474	648
1 to 5 Years | Over-the-counter foreign exchange contracts | Forward contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	4,137	15
1 to 5 Years | Over-the-counter foreign exchange contracts | Foreign currency swap contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	3,723	4,451
1 to 5 Years | Over-the-counter other contracts | Forward contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	176	158
1 to 5 Years | Over-the-counter other contracts | Swap contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	1	1
1 to 5 Years | Over-the-counter other contracts | Options purchased | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	0	0
1 to 5 Years | Over-the-counter other contracts | Credit derivatives | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	878	1,329
1 to 5 Years | Exchange-traded interest rate contracts | Futures contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	0	0
1 to 5 Years | Exchange-traded equity contracts | Options purchased | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	0	0
1 to 5 Years | Exchange-traded equity contracts | Options written | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	0	0
1 to 5 Years | Exchange-traded equity contracts | Futures contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	0	0
Over 5 Years | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	29,871	29,884
Over 5 Years | Over-the-counter interest rate contracts | Forward contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	0	0
Over 5 Years | Over-the-counter interest rate contracts | Interest rate swap contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	14,649	16,685
Over 5 Years | Over-the-counter interest rate contracts | Options purchased | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	2,850	3,737
Over 5 Years | Over-the-counter interest rate contracts | Options written | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	0	225
Over 5 Years | Over-the-counter foreign exchange contracts | Forward contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	0	0
Over 5 Years | Over-the-counter foreign exchange contracts | Foreign currency swap contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	12,366	9,210
Over 5 Years | Over-the-counter other contracts | Forward contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	0	0
Over 5 Years | Over-the-counter other contracts | Swap contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	0	0
Over 5 Years | Over-the-counter other contracts | Options purchased | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	0	0
Over 5 Years | Over-the-counter other contracts | Credit derivatives | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	6	27
Over 5 Years | Exchange-traded interest rate contracts | Futures contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	0	0
Over 5 Years | Exchange-traded equity contracts | Options purchased | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	0	0
Over 5 Years | Exchange-traded equity contracts | Options written | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	0	0
Over 5 Years | Exchange-traded equity contracts | Futures contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	$ 0	$ 0

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The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

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