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Derivatives Instruments (Master Netting Agreements) (Details) - CAD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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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

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