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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - OTHER FINANCIAL INSTRUMENTS (Details) - CAD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fair Value of Other Financial Instruments
Equity investments at carrying value		$ 52,000,000	$ 99,000,000
Impairment of equity investments		2,351,000,000	0	$ 0
Restricted long-term investments		553,000,000	434,000,000
Long-term debt		75,100,000,000	70,500,000,000
Long-term loans receivable from affiliates		1,100,000,000	1,000,000,000.0
Net Investment Hedges
Fair Value of Other Financial Instruments
Unrealized foreign exchange gain (loss) on translation of United States dollar denominated debt		(117,000,000)	317,000,000
Unrealized gain (loss) on change in fair value of outstanding forward exchange forward contracts		13,000,000	2,000,000
Realized loss associated with the settlement of foreign exchange forward contracts		15,000,000	0
Realized gain (loss) associated with the settlement of United Stated dollar denominated debt that matured		0	0
Carrying value
Fair Value of Other Financial Instruments
Long-term debt		66,100,000,000	64,400,000,000
Preference shares (Note 21)
Fair Value of Other Financial Instruments
Held-to-maturity securities		$ 567,000,000	580,000,000
Cumulative dividends based on average yield of Government of Canada bonds, maturity period of bonds		10 years
Held to maturity preferred share investment		$ 567,000,000	580,000,000
Noverco Common Shares \| Preference shares (Note 21)
Fair Value of Other Financial Instruments
Cumulative dividends based on average yield of Government of Canada bonds, spread over reference rate (as a percent)		4.38%
DCP Midstream, LP
Fair Value of Other Financial Instruments
Impairment of equity investments	$ 1,700,000,000
Equity investment		$ 331,000,000
Southeast Supply Header L.L.C.
Fair Value of Other Financial Instruments
Impairment of equity investments		394,000,000
Equity investment		$ 84,000,000	484,000,000
Southeast Supply Header L.L.C. \| Measurement Input, Weighted Average Cost of Capital [Member] \| Valuation Technique, Discounted Cash Flow [Member]
Fair Value of Other Financial Instruments
Equity Method Investment, Measurement Input		8.00%
Southeast Supply Header L.L.C. \| Measurement Input, Long-term Revenue Growth Rate [Member] \| Valuation Technique, Discounted Cash Flow [Member]
Fair Value of Other Financial Instruments
Equity Method Investment, Measurement Input		0.50%
Steckman Ridge, LP
Fair Value of Other Financial Instruments
Impairment of equity investments		$ 221,000,000
Equity investment		$ 90,000,000	$ 222,000,000
Steckman Ridge, LP \| Measurement Input, Weighted Average Cost of Capital [Member] \| Valuation Technique, Discounted Cash Flow [Member]
Fair Value of Other Financial Instruments
Equity Method Investment, Measurement Input		9.00%
Steckman Ridge, LP \| Measurement Input, Long-term Revenue Growth Rate [Member] \| Valuation Technique, Discounted Cash Flow [Member]
Fair Value of Other Financial Instruments
Equity Method Investment, Measurement Input		1.00%