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Financial Instrument Risk Management - Notional Amount of Derivative Financial Instruments (Details) - CAD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]
Financial assets	$ 168,785	$ 152,785
Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	62,792	62,131
Swap contracts
Disclosure of detailed information about financial instruments [line items]
Financial assets	912	1,227
Over-the-counter interest rate contracts | Forward contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	6	50
Over-the-counter interest rate contracts | Interest rate swap contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	17,675	19,607
Over-the-counter interest rate contracts | Options purchased | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	6,288	6,746
Over-the-counter interest rate contracts | Options written | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	465	831
Over-the-counter foreign exchange contracts | Forward contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	12,236	9,426
Over-the-counter foreign exchange contracts | Foreign currency swap contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	18,524	16,956
Over-the-counter other contracts | Forward contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	307	304
Over-the-counter other contracts | Swap contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	171	179
Over-the-counter other contracts | Options purchased | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	127	1,164
Over-the-counter other contracts | Credit derivatives | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	912	1,227
Exchange-traded interest rate contracts | Futures contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	3,389	2,917
Exchange-traded equity contracts | Options purchased | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	127	200
Exchange-traded equity contracts | Options written | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	12	17
Exchange-traded equity contracts | Futures contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	2,553	2,507
Under 1 Year | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	21,909	16,540
Under 1 Year | Over-the-counter interest rate contracts | Forward contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	0	50
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	1,010	1,906
Under 1 Year | Over-the-counter interest rate contracts | Options purchased | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	757	617
Under 1 Year | Over-the-counter interest rate contracts | Options written | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	0	357
Under 1 Year | Over-the-counter foreign exchange contracts | Forward contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	12,205	5,289
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	1,260	867
Under 1 Year | Over-the-counter other contracts | Forward contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	132	128
Under 1 Year | Over-the-counter other contracts | Swap contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	170	178
Under 1 Year | Over-the-counter other contracts | Options purchased | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	119	1,164
Under 1 Year | Over-the-counter other contracts | Credit derivatives | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	175	343
Under 1 Year | Exchange-traded interest rate contracts | Futures contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	3,389	2,917
Under 1 Year | Exchange-traded equity contracts | Options purchased | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	127	200
Under 1 Year | Exchange-traded equity contracts | Options written | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	12	17
Under 1 Year | Exchange-traded equity contracts | Futures contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	2,553	2,507
1 to 5 Years | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	10,829	15,720
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	6	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	3,363	3,052
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	3,246	3,279
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	465	474
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	31	4,137
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	2,797	3,723
1 to 5 Years | Over-the-counter other contracts | Forward contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	175	176
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	8	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	737	878
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	30,054	29,871
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	13,302	14,649
Over 5 Years | Over-the-counter interest rate contracts | Options purchased | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	2,285	2,850
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	0
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	14,467	12,366
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	0	6
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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