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LONG-TERM INVESTMENTS - Narrative (Details) € in Millions, $ in Millions, $ in Millions |  |  |  |  |  | 12 Months Ended |  |  |  |
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Nov. 15, 2023 CAD ($) | Nov. 15, 2023 USD ($) | Nov. 03, 2023 CAD ($) | Nov. 03, 2023 EUR (€) | Nov. 29, 2022 CAD ($) | Nov. 29, 2022 USD ($) | Aug. 17, 2022 CAD ($) | Aug. 17, 2022 USD ($) | Dec. 30, 2021 CAD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 CAD ($) | Dec. 31, 2021 CAD ($) | Nov. 03, 2023 EUR (€) | Jan. 09, 2023 | Aug. 16, 2022 | Jun. 06, 2021
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill of investee |  |  |  |  |  |  |  |  |  | $ 3,500 |  | $ 3,400 |  |  |  |  |
Amortizable assets of investee |  |  |  |  |  |  |  |  |  | 1,700 |  | 1,500 |  |  |  |  |
Dividends received from equity investments |  |  |  |  |  |  |  |  |  | 3,100 |  | 2,600 | $ 2,200 |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  | 80,438 |  |  |  |  |  |  |
Proceeds from sale of equity method investments |  |  |  |  |  |  | $ 522 | $ 404 |  |  |  |  |  |  |  |  |
Gain on joint venture merger transaction |  |  |  |  |  |  | $ 1,100 | $ 832 |  | 0 |  | 1,076 | 0 |  |  |  |
Proceeds from joint venture merger transaction (Note 13) |  |  |  |  |  |  |  |  |  | 0 |  | 522 | 0 |  |  |  |
Woodfibre LNG Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire equity method investments |  |  |  |  | $ 533 | $ 392 |  |  |  |  |  |  |  |  |  |  |
Fox Squirrel Solar LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) | 50.00% | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration includes an upfront payment | $ 157 | $ 115 |  |  |  |  |  |  |  | $ 164 | $ 123 |  |  |  |  |  |
Investment company committed capital threshold amount | $ 398 | $ 291 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gray Oak Pipeline, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  |  |  |  |  |  | 65.00% |  |  |  |  |  |  |
Gray Oak Pipeline, LLC | Gray Oak Pipeline, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  |  |  |  |  |  | 58.50% |  |  |  |  | 68.50% |  |
Equity method investment direct ownership interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.100 |  |
Woodfibre LNG Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  | 30.00% | 30.00% |  |  |  |  |  |  |  |  |  |  |
Hohe See Offshore And Albatros Offshore Wind Farm |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  | 49.90% |  |  |  |  |  |  |  |  |  |  | 49.90% |  |  |
Ownership interest acquired additionally (as a percent) |  |  | 24.45% |  |  |  |  |  |  |  |  |  |  | 24.45% |  |  |
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 a percent) |  |  |  |  |  |  | 58.50% | 58.50% |  |  |  |  |  |  |  | 22.80% |
DCP LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  |  |  | 13.20% | 13.20% |  |  |  |  |  |  |  | 28.30% |
Noverco Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on joint venture merger transaction |  |  |  |  |  |  |  |  |  |  |  |  | 303 |  |  |  |
Proceeds from joint venture merger transaction (Note 13) |  |  |  |  |  |  |  |  | $ 1,100 |  |  |  |  |  |  |  |
Noverco Preferred Shares | IPL Systems Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 38.90%
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 |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 0 |  |  |  |  |

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