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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Fair Value of Non-Derivative Financial Instruments (Details) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019 CAD ($)	Dec. 31, 2018 CAD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Carrying and fair values of non-derivative financial instruments
Long-term debt, including current portion (Note 17)	$ (37,019)	$ (39,982)
Junior subordinated notes (Note 19)	(8,614)	(7,508)
Long-term debt			$ 200	$ 750
Interest rate swap agreements
Carrying and fair values of non-derivative financial instruments
Unrealized losses on hedged items	3	2
Long-term debt hedged			$ 200	$ 750
Level II | Carrying Amount
Carrying and fair values of non-derivative financial instruments
Long-term debt, including current portion (Note 17)	(36,985)	(39,971)
Junior subordinated notes (Note 19)	(8,614)	(7,508)
Total liabilities	(45,599)	(47,479)
Level II | Fair Value
Carrying and fair values of non-derivative financial instruments
Long-term debt, including current portion (Note 17)	(43,187)	(42,284)
Junior subordinated notes (Note 19)	(8,777)	(6,665)
Total liabilities	$ (51,964)	$ (48,949)

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Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Junior Subordinated Notes, which have a lower priority than senior instruments, excluding current portion.

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Fair value of financial and nonfinancial obligations.

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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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