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ACQUISITIONS AND DISPOSITIONS - Acquisitions (Narrative) (Details) $ / shares in Units, $ in Millions, $ in Millions |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |
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Nov. 01, 2023 CAD ($) | Sep. 08, 2023 CAD ($) $ / shares shares | Sep. 05, 2023 CAD ($) agreement | Sep. 05, 2023 USD ($) agreement | Apr. 03, 2023 CAD ($) | Apr. 03, 2023 USD ($) | Sep. 27, 2022 CAD ($) | Sep. 27, 2022 USD ($) | Oct. 12, 2021 CAD ($) | Oct. 12, 2021 USD ($) | Nov. 30, 2023 CAD ($) offering | Sep. 30, 2023 CAD ($) offering | Sep. 30, 2023 USD ($) offering | Dec. 31, 2021 CAD ($) | Dec. 31, 2021 CAD ($) | Nov. 01, 2023 USD ($) | Apr. 03, 2023 USD ($) | Sep. 27, 2022 USD ($) | Oct. 12, 2021 USD ($)
Public Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period, shares, new issues (in shares) | shares |  | 102,913,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, price per share (in Canadian dollars per share) | $ / shares |  | $ 44.70 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued, net of issue costs |  | $ 4,600 |  |  |  |  |  |  |  |  |  | $ 4,600 |  |  |  |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of offerings | offering |  |  |  |  |  |  |  |  |  |  | 4 | 2 | 2 |  |  |  |  |  |
Sale of stock, consideration received on transaction |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  | $ 5,500 |  |  |  |  |  |
Aitken Creek Gas Storage Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 93.80% |  |  |
Aitken Creek North Gas Storage Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |
Aitken Creek Gas Storage Facility And Aitken Creek North Gas Storage Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | $ 400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The East Ohio Gas Company, Questar Gas Company, And Wexpro Companies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  | $ 12,800 | $ 9,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of agreements | agreement |  |  | 3 | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  | $ 19,100 | $ 14,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assumed debt |  |  | $ 6,300 | $ 4,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tres Palacios Holdings LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  | $ 451 | $ 335 |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  | 790 |  |  |  |  |  |  |  |  |  |  |  | $ 588 |  |
Business combination, recognized identifiable assets acquired and liabilities assumed, property, plant, and equipment |  |  |  |  | 254 |  |  |  |  |  |  |  |  |  |  |  | 189 |  |
Long-term liabilities |  |  |  |  | 7 |  |  |  |  |  |  |  |  |  |  |  | 5 |  |
Long-term debt |  |  |  |  | $ 248 |  |  |  |  |  |  |  |  |  |  |  | $ 184 |  |
Tri Global Energy, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  |  | $ 295 | $ 215 |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  | 344 |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |
Long-term liabilities |  |  |  |  |  |  | 105 |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  | 18 |  |  |  |  |  |  |  |  |  |  |  |
Contingent future payment (up to) |  |  |  |  |  |  | 72 |  |  |  |  |  |  |  |  | $ 53 |  | $ 53 |
Contingent consideration |  |  |  |  |  |  | $ 49 |  |  |  |  |  |  |  |  | $ 36 |  |  |
Moda Midstream Operating, LLC (Moda) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  |  |  |  | $ 3,755 | $ 3,000 |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  | 3,942 |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |  | 1,480 |  |  |  |  |  |  |  |  |  |
Long-term liabilities |  |  |  |  |  |  |  |  | 17 |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  |  |  | $ 187 |  |  |  |  |  |  |  |  |  | $ 150
Acquisition-related expenses/transaction costs incurred |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21 |  |  |  |
Revenues generated by acquiree |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 80 |  |  |  |  |
Earnings generated by acquiree |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9 |  |  |  |  |

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