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DEBT - Narrative (Details) - CAD ($)	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Line of Credit Facility [Line Items]
Line of credit facility, increase (decrease), net	$ 444,000,000
Commitment fee percentage	0.10%
Long-term debt	$ 60,680,000,000	$ 60,327,000,000
Long-term debt, fair value adjustment	930,000,000
Amortization of fair value adjustment	17,000,000
Uncommitted demand credit facilities
Line of Credit Facility [Line Items]
Amount of credit facility	800,000,000	807,000,000
Unutilized amount of facility	516,000,000	548,000,000
Commercial paper and credit facility draws
Line of Credit Facility [Line Items]
Long-term debt	10,689,000,000	7,967,000,000
Subordinated Debt | Fixed To Floating Subordinated Term Notes
Line of Credit Facility [Line Items]
Subordinated debt	$ 6,675,000,000	$ 7,317,000,000

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Amortization Of Fair Value Adjustment

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Amount of addition (reduction) to the amount at which a liability could be incurred (settled) in a current transaction between willing parties.

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Amount of increase (decrease) of the credit facility.

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-SubTopic 10
-Section S99
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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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