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Financial Instrument Risk Management - Notional Amount of Derivative Financial Instruments (Details) - CAD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]
Financial assets	$ 143,061	$ 137,691
Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	59,198	54,121
Swap contracts
Disclosure of detailed information about financial instruments [line items]
Financial assets	1,356	1,121
Over-the-counter interest rate contracts | Forward contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	0	469
Over-the-counter interest rate contracts | Interest rate swap contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	21,292	20,887
Over-the-counter interest rate contracts | Options purchased | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	7,833	5,779
Over-the-counter interest rate contracts | Options written | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	1,350	1,245
Over-the-counter foreign exchange contracts | Forward contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	6,544	6,347
Over-the-counter foreign exchange contracts | Foreign currency swap contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	14,193	11,744
Over-the-counter other contracts | Forward contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	285	259
Over-the-counter other contracts | Swap contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	113	127
Over-the-counter other contracts | Credit derivatives | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	1,356	1,121
Exchange-traded interest rate contracts | Futures contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	3,669	3,415
Exchange-traded equity contracts | Options purchased | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	186	512
Exchange-traded equity contracts | Futures contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	2,377	2,216
Under 1 Year | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	16,308	15,895
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	469
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	1,101	1,348
Under 1 Year | Over-the-counter interest rate contracts | Options purchased | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	1,198	1,062
Under 1 Year | Over-the-counter interest rate contracts | Options written | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	477	0
Under 1 Year | Over-the-counter foreign exchange contracts | Forward contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	6,529	6,305
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	532	332
Under 1 Year | Over-the-counter other contracts | Forward contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	127	109
Under 1 Year | Over-the-counter other contracts | Swap contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	112	126
Under 1 Year | Over-the-counter other contracts | Credit derivatives | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	0	48
Under 1 Year | Exchange-traded interest rate contracts | Futures contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	3,669	3,415
Under 1 Year | Exchange-traded equity contracts | Options purchased | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	186	465
Under 1 Year | Exchange-traded equity contracts | Futures contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	2,377	2,216
1 to 5 Years | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	13,006	11,879
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	3,506	3,486
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	2,898	2,266
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	648	786
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	15	42
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	4,451	4,198
1 to 5 Years | Over-the-counter other contracts | Forward contracts | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	158	150
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 | Credit derivatives | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	1,329	903
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	47
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	29,884	26,347
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	16,685	16,053
Over 5 Years | Over-the-counter interest rate contracts | Options purchased | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	3,737	2,451
Over 5 Years | Over-the-counter interest rate contracts | Options written | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	225	459
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	9,210	7,214
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 | Credit derivatives | Derivative assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	27	170
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 | 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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