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Represents the maturity period of the Government of Canada bonds that are used as the variable reference rate for the calculation of cumulative dividends.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of investment in debt security measured at amortized cost (held-to-maturity).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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Fair value portion of an agreement for an unconditional promise by the maker to pay the holder a definite sum of money at a future date.

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Amount before tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount, before tax and adjustments, of gain (loss) from increase (decrease) in value of excluded component of derivative designated and qualifying as hedge. Adjustments include, but are not limited to, reclassifications for sale and settlement, and amounts recognized under systematic and rational method.

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Amount before tax of reclassification adjustment from accumulated other comprehensive income for translation gain (loss) realized upon the sale or liquidation of an investment in a foreign entity and foreign currency hedges that are designated and qualified as hedging instruments for hedges of the foreign currency exposure of a net investment in a foreign operation.

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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Other Financial Instruments (Details) - CAD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Fair Value of Other Financial Instruments
FMVA investments		$ 56		$ 99
Long-term debt, carrying value		66,900		64,400
Long-term debt		74,100		70,500
Southeast Supply Header, LLC
Fair Value of Other Financial Instruments
Carrying value of investment		$ 87		484
Southeast Supply Header, LLC \| Weighted Average Cost of Capital \| Discounted Cash Flow Model
Fair Value of Other Financial Instruments
Fair value measurement input (percent)		8.00%
Southeast Supply Header, LLC \| Long-term Revenue Growth Rate \| Discounted Cash Flow Model
Fair Value of Other Financial Instruments
Fair value measurement input (percent)		0.50%
Steckman Ridge, LP
Fair Value of Other Financial Instruments
Carrying value of investment		$ 96		222
Steckman Ridge, LP \| Weighted Average Cost of Capital \| Discounted Cash Flow Model
Fair Value of Other Financial Instruments
Fair value measurement input (percent)		9.00%
Steckman Ridge, LP \| Long-term Revenue Growth Rate \| Discounted Cash Flow Model
Fair Value of Other Financial Instruments
Fair value measurement input (percent)		1.00%
Net Investment Hedges
Fair Value of Other Financial Instruments
Unrealized foreign exchange gain (loss) on translation of United States dollar denominated debt		$ (226)	$ 166
Unrealized gain (loss) on change in fair value of outstanding forward exchange forward contracts	$ 13		1
Net Investment Hedges \| Foreign exchange contracts
Fair Value of Other Financial Instruments
Realized gain (loss) associated with the settlement of United Stated dollar denominated debt that matured		(15)	0
Net Investment Hedges \| United States Dollar Denominated Debt
Fair Value of Other Financial Instruments
Realized gain (loss) associated with the settlement of United Stated dollar denominated debt that matured		0	$ 0
Preferred share investment
Fair Value of Other Financial Instruments
Held to maturity investment at amortized cost		$ 566		580
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		580
Fair Value
Fair Value of Other Financial Instruments
Restricted long-term investments held in trust		527		434
Carrying value
Fair Value of Other Financial Instruments
Noncurrent notes receivable		$ 1,100		$ 1,000