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Derivatives Instruments (Master Netting Agreements) (Details) - CAD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Total impact of master netting agreements with intent to settle net or simultaneously, Derivative Assets	$ 120	$ 126
Total impact of master netting agreements with intent to settle net or simultaneously, Derivative Liabilities	120	126
Regulatory deferral
Derivatives, Fair Value [Line Items]
Total impact of master netting agreements with intent to settle net or simultaneously, Derivative Assets	8	1
Total impact of master netting agreements with intent to settle net or simultaneously, Derivative Liabilities	8	1
HFT derivatives
Derivatives, Fair Value [Line Items]
Total impact of master netting agreements with intent to settle net or simultaneously, Derivative Assets	112	125
Total impact of master netting agreements with intent to settle net or simultaneously, Derivative Liabilities	$ 112	$ 125

X

- Definition

Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958

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X

- Definition

Amount of right to receive cash collateral under master netting arrangements offset against derivative liabilities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

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+ References

No definition available.

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