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BORROWINGS - Additional Information (Details) $ in Millions |  |  |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 24, 2021 USD ($) | Sep. 01, 2020 CAD ($) | Nov. 06, 2019 CAD ($) | Dec. 31, 2021 USD ($) extension | Feb. 24, 2021 USD ($) | Dec. 31, 2020 USD ($) | Apr. 14, 2020 USD ($) | Apr. 07, 2020 CAD ($) | Oct. 07, 2019 CAD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  | $ 1,131,000,000 |  |  |  |  |
Commercial papers issued |  |  |  | 431,000,000 |  | $ 0 |  |  |
Notional Amount (U.S. Dollars) |  |  |  | 14,902,000,000 |  | 14,743,000,000 |  |  |
Debt in breach of asset-level financial covenants |  |  |  | 145,000,000 |  |  |  |  |
Corporate revolving credit facility |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  | $ 1,975,000,000 |  |  |  |  |
Basis points |  |  |  | 0.0013 |  |  |  |  |
Non-recourse borrowings |  |  |  | $ 0 |  | 1,131,000,000 |  |  |
Letter of credit outstanding amount |  |  |  | $ 12,000,000 |  | 63,000,000 |  |  |
Borrowings renewal period |  |  |  | 1 year |  |  |  |  |
Borrowings renewal period, number of extensions available | extension |  |  |  | 4 |  |  |  |  |
Corporate revolving credit facility | Floating interest rate |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  | 1.20% |  |  |  |  |
Commercial Paper Program |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Non-recourse borrowings |  |  |  | $ 431,000,000 |  | 0 |  |  |
Commercial Paper Program | Establishment of Commercial Paper Program |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Commercial papers issued |  |  |  |  | $ 500,000,000 |  |  |  |
Commercial Paper Program | Fixed interest rate |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Annual rate |  |  |  | 0.37% |  |  |  |  |
Syndicated Revolving Credit Facility |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  | $ 1,000,000,000 |  |  | $ 1,000,000,000 |  |
Line of credit, amount drawn |  |  |  |  |  | 0 |  |  |
Syndicated Revolving Credit Facility | Bottom of range |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Basis points |  |  |  |  |  |  | 0.0042 |  |
Syndicated Revolving Credit Facility | Top of range |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Basis points |  |  |  |  |  |  | 0.0044 |  |
Syndicated Revolving Credit Facility | Floating interest rate | Bottom of range |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  |  |  |  | 2.10% |  |
Syndicated Revolving Credit Facility | Floating interest rate | Top of range |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  |  |  |  | 2.20% |  |
Medium-term Notes, Maturing October 9, 2029 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Non-recourse borrowings |  |  |  | $ 554,000,000 |  | 550,000,000 |  |  |
Notional Amount (U.S. Dollars) |  |  |  |  |  |  |  | $ 200 | $ 500
Annual rate |  |  |  |  |  |  |  | 3.40% | 3.50%
Borrowings, effective interest rate |  |  |  |  |  |  |  | 4.10% |
Medium-term Notes, Maturing October 9, 2029 | Debt Issuers |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Amount repaid |  |  | $ 375 |  |  |  |  |  |
Medium-term Notes, Maturing October 9, 2029 | Fixed interest rate |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Annual rate |  |  |  | 3.40% |  |  |  |  |
Medium-term Notes, Maturing October 9, 2029 | Fixed interest rate | Debt Issuers |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Annual rate |  |  |  |  |  |  |  | 3.40% | 3.40%
Medium Term Notes |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Notional Amount (U.S. Dollars) |  |  |  |  |  |  |  | $ 400 |
Medium-term Notes, Maturing September 11, 2028 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Non-recourse borrowings |  |  |  | $ 554,000,000 |  | 550,000,000 |  |  |
Notional Amount (U.S. Dollars) |  |  |  |  |  |  |  | $ 200 |
Borrowings, effective interest rate |  |  |  |  |  |  |  | 4.10% |
Medium-term Notes, Maturing September 11, 2028 | Fixed interest rate |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Annual rate |  |  |  | 4.20% |  |  |  |  |
Medium-term Notes, Maturing September 11, 2028 | Fixed interest rate | Debt Issuers |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Annual rate |  |  |  |  |  |  |  | 4.20% |
Corporate borrowings |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Non-recourse borrowings |  |  |  | $ 2,739,000,000 |  | 3,173,000,000 |  |  |
Increase (decrease) in corporate borrowings |  |  |  | (434,000,000) |  |  |  |  |
Revolving credit facility with Brookfield |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  | 500,000,000 |  |  |  |  |
Non-recourse borrowings |  |  |  | $ 0 |  | 0 |  |  |
Revolving credit facility with Brookfield | Floating interest rate |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  | 1.80% |  |  |  |  |
Commitment fees |  |  |  | $ 0 |  |  |  |  |
Non-recourse borrowings |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Non-recourse borrowings |  |  |  | 26,534,000,000 |  | 20,020,000,000 |  |  |
Increase in borrowings |  |  |  | 6,500,000,000 |  |  |  |  |
Non-recourse borrowings | Disposal Group Disposed of By Sale Not Discontinued Operations |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Increase in borrowings |  |  |  | 8,700,000,000 |  |  |  |  |
Non-recourse borrowings | Canadian diversified midstream operation |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Increase in borrowings |  |  |  | 6,700,000,000 |  |  |  |  |
Non-recourse borrowings | CAD |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Non-recourse borrowings |  |  |  | 9,257,000,000 |  | 2,400,000,000 |  |  |
Non-recourse borrowings | USD |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Non-recourse borrowings |  |  |  | 7,376,000,000 |  | 7,457,000,000 |  |  |
Medium-term Notes, Maturing September 1, 2032 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Non-recourse borrowings |  |  |  | $ 396,000,000 |  | 392,000,000 |  |  |
Notional Amount (U.S. Dollars) |  | $ 500 |  |  |  |  |  |  |
Amount repaid |  | $ 450 |  |  |  |  |  |  |
Medium-term Notes, Maturing September 1, 2032 | Fixed interest rate |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Annual rate |  |  |  | 2.90% |  |  |  |  |
Medium-term Notes, Maturing September 1, 2032 | Fixed interest rate | Debt Issuers |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Annual rate |  | 2.90% |  |  |  |  |  |  |
Medium-term Notes, Maturing September 1, 2032 | Fixed interest rate | Debt Issuers | CAD |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Annual rate |  | 2.90% |  |  |  |  |  |  |
Medium-term Notes, Maturing September 1, 2032 | Fixed interest rate | Debt Issuers | USD |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Annual rate |  | 3.90% |  |  |  |  |  |  |
Subordinated Notes |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Non-recourse borrowings |  |  |  | $ 250,000,000 |  |  |  |  |
Subordinated notes, Maturing 2081 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Non-recourse borrowings | $ 250,000,000 |  |  | $ 250,000,000 |  | $ 0 |  |  |
Annual rate | 5.00% |  |  |  |  |  |  |  |
Debt issuance costs | $ 6,000,000 |  |  |  |  |  |  |  |
Subordinated notes, Maturing 2081 | Fixed interest rate |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Annual rate |  |  |  | 5.00% |  |  |  |  |

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