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LONG-TERM INVESTMENTS - Narrative (Details) - CAD ($) $ in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 30, 2021 | Jun. 06, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Mar. 18, 2021
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Goodwill of investee |  |  | $ 2,500 | $ 2,400 |  |
Amortizable assets of investee |  |  | 730 | 657 |  |
Dividends received from equity investments |  |  | 2,200 | 2,100 | $ 2,200 |
Ownership interest (as a percent) |  |  |  |  |  | 25.50%
Impairment of equity investments |  |  | 111 | 2,351 | 0 |
Loss from equity method investment |  |  | $ (1,711) | (1,136) | $ (1,503) |
Noverco Preferred Shares |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership interest (as a percent) |  | 38.90% |  |  |  |
Equity method investment cash subject to purchase price adjustments |  | $ 1,100 |  |  |  |
Proceeds from sale of equity method investments | $ 1,100 |  |  |  |  |
Equity method investment, realized gain (loss) on disposal | $ 303 |  |  |  |  |
PennEast Pipeline Company, LLC |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership interest (as a percent) |  |  | 20.00% |  |  |
Impairment of equity investments |  |  | $ 111 |  |  |
Equity investment |  |  | 12 | $ 116 |  |
Steckman Ridge, LP |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  | 50.00% |  |
Impairment of equity investments |  |  |  | $ 221 |  |
Equity investment |  |  | 88 | $ 90 |  |
Southeast Supply Header L.L.C. |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  | 50.00% |  |
Impairment of equity investments |  |  |  | $ 394 |  |
Equity investment |  |  | $ 82 | 84 |  |
DCP Midstream, LLC |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership interest (as a percent) |  |  | 50.00% |  |  |
Impairment of equity investments |  |  |  | 1,700 |  |
Equity investment |  |  | $ 397 | $ 331 |  |
Loss from equity method investment |  |  | $ 324 |  |  |
Gas Distribution and Storage | Common Shares | Noverco Preferred Shares |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership interest (as a percent) |  |  | 38.90% | 38.90% |  |
Equity investment |  |  | $ 0 | $ 156 |  |

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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=124268079&loc=d3e32787-111569 + Details
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