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LONG-TERM DEBT - Interest Expense (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest Expense [Abstract]
Capitalized interest	$ (186)	$ (124)	$ (173)
Amortization and other financial charges	55	48	67
Interest expense	2,333	2,265	2,069
Interest payments, net of interest capitalized	2,295	2,156	1,987
Short-term debt
Interest Expense [Abstract]
Interest on debt	106	73	33
Long-term debt (excluding junior subordinated notes)
Interest Expense [Abstract]
Interest on debt	1,931	1,877	1,794
Junior subordinated notes
Interest Expense [Abstract]
Interest on debt	$ 427	$ 391	$ 348

X

- Definition

Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

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Amount of interest capitalized during the period.

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Amount of the cost of borrowed funds accounted for as interest expense.

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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

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Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

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