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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Other Financial Instruments (Details) - CAD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Fair Value of Other Financial Instruments
FMVA investments	$ 52		$ 52
Long-term debt, carrying value	67,000		66,100
Long-term debt	72,500		75,100
Net Investment Hedges
Fair Value of Other Financial Instruments
Unrealized foreign exchange gain (loss) on translation of United States dollar denominated debt	105	$ (708)
Unrealized gain (loss) on change in fair value of outstanding forward exchange forward contracts	0	$ (7)
Preferred share investment
Fair Value of Other Financial Instruments
Held to maturity investment at amortized cost	$ 566		567
Cumulative dividends based on average yield of Government of Canada bonds, maturity period of bonds	10 years
Cumulative dividends based on average yield of Government of Canada bonds, spread over reference rate (as a percent)	4.38%
Held to maturity investment, fair value	$ 566		567
Fair Value
Fair Value of Other Financial Instruments
Restricted long-term investments held in trust	529		553
Carrying value
Fair Value of Other Financial Instruments
Noncurrent notes receivable	$ 1,000		$ 1,100

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The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations.

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