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LONG-TERM INVESTMENTS - Equity Investment Transaction (Details) € in Millions, $ in Millions, $ in Millions |  |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 29, 2024 CAD ($) | May 29, 2024 USD ($) | Nov. 15, 2023 CAD ($) | Nov. 15, 2023 USD ($) | Nov. 03, 2023 CAD ($) | Nov. 03, 2023 EUR (€) | Aug. 17, 2022 CAD ($) | Aug. 17, 2022 USD ($) | Dec. 31, 2024 CAD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2022 CAD ($) | May 28, 2024 | Nov. 03, 2023 EUR (€) | Aug. 16, 2022
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  | $ 101,819 |  |  |  |  |
Proceeds from sale of equity method investments |  |  |  |  |  |  | $ 522 | $ 404 |  |  |  |  |  |
Gain on joint venture merger transaction |  |  |  |  |  |  | $ 1,100 | $ 832 | $ 0 | $ 0 | $ 1,076 |  |  |
Whistler Parent JV |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) | 19.00% | 19.00% |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration includes an upfront payment | $ 487 | $ 357 |  |  |  |  |  |  |  |  |  |  |  |
Reduction to property, plant and equipment, net and increase to long-term investments | $ 321 | $ 235 |  |  |  |  |  |  |  |  |  |  |  |
Whistler Parent JV | WhiteWaterI Squared |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) | 50.60% | 50.60% |  |  |  |  |  |  |  |  |  |  |  |
Whistler Parent JV | MPLX |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) | 30.40% | 30.40% |  |  |  |  |  |  |  |  |  |  |  |
Rio Bravo |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) | 25.00% | 25.00% |  |  |  |  |  |  |  |  |  | 100.00% |  |
Capital Expenditure, Discontinued Operations |  | $ 150 |  |  |  |  |  |  |  |  |  |  |  |
Fox Squirrel Solar LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  | 50.00% | 50.00% |  |  |  |  |  |  |  |  |  |
Cash consideration includes an upfront payment |  |  | $ 157 | $ 115 |  |  |  |  |  |  |  |  |  |
Investment company committed capital threshold amount |  |  | $ 591 | $ 426 |  |  |  |  |  |  |  |  |  |
Hohe See Offshore And Albatros Offshore Wind Farm |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  | 49.90% |  |  |  |  |  |  |  | 49.90% |
Ownership interest acquired additionally (as a percent) |  |  |  |  | 24.45% |  |  |  |  |  |  |  | 24.45% |
Enbridge Renewable Infrastructure Investments S.a.r.l. (ERII) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest acquired additionally (as a percent) |  |  |  |  | 49.00% |  |  |  |  |  |  |  | 49.00% |
Payments to acquire equity method investments |  |  |  |  | $ 391 | € 267 |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  | $ 524 |  |  |  |  |  |  |  | € 358 |
Gray Oak Holdings LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  |  | 58.50% | 58.50% |  |  |  |  |  | 22.80%
DCP LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  |  | 13.20% | 13.20% |  |  |  |  |  | 28.30%

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