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BORROWINGS - Additional Information (Details) $ in Millions |  |  |  | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 01, 2020 CAD ($) | Nov. 06, 2019 CAD ($) | Oct. 30, 2018 CAD ($) | Dec. 31, 2020 USD ($) | Feb. 24, 2021 USD ($) | Dec. 31, 2020 CAD ($) | Apr. 14, 2020 USD ($) | Apr. 07, 2020 CAD ($) | Dec. 31, 2019 USD ($) | Oct. 07, 2019 CAD ($) | Sep. 10, 2018 CAD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Notional Amount (U.S. Dollars) |  |  |  | $ 14,743,000,000 |  |  |  |  | $ 15,855,000,000 |  |
Indian telecom towers operation |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Non-recourse borrowings |  |  |  | 3,500,000,000 |  |  |  |  |  |  |
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 |  | 0.0013 |  |  |  |  |
Non-recourse borrowings |  |  |  | $ 1,131,000,000 |  |  |  |  | 820,000,000 |  |
Letter of credit outstanding amount |  |  |  | 63,000,000 |  |  |  |  | 54,000,000 |  |
Increase (decrease) in corporate borrowings |  |  |  | $ 311,000,000 |  |  |  |  |  |  |
Corporate revolving credit facility | Floating interest rate |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  | 1.20% |  | 1.20% |  |  |  |  |
Commercial Paper Program | Establishment of Commercial Paper Program |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Commercial papers issued |  |  |  |  | $ 500,000,000 |  |  |  |  |  |
Syndicated Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  | $ 1,000,000,000.0 |  |  | $ 1,000,000,000.0 |  |  |  |
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 |  |  |  | $ 550,000,000 |  |  |  |  | 386,000,000 |  |
Notional Amount (U.S. Dollars) |  |  |  |  |  |  |  | $ 200 |  | $ 500 |
Borrowings, interest 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] |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  | 3.40% |  | 3.40% |  |  |  |  |
Medium-term Notes, Maturing October 9, 2029 | Fixed interest rate | Debt Issuers | CAD |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  | 3.40% |  | 3.40% |
Medium Term Notes, Maturing October 30, 2018 | Debt Issuers |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Amount repaid |  |  | $ 125 |  |  |  |  |  |  |  |
Medium Term Notes |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Notional Amount (U.S. Dollars) |  |  |  |  |  | $ 900 |  | $ 400 |  |  |
Medium-term Notes, Maturing September 11, 2028 |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Non-recourse borrowings |  |  |  | $ 550,000,000 |  |  |  |  | 384,000,000 |  |
Notional Amount (U.S. Dollars) |  |  |  |  |  |  |  | $ 200 |  |  | $ 500
Borrowings, effective interest rate |  |  |  |  |  |  |  | 4.10% |  |  |
Medium-term Notes, Maturing September 11, 2028 | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  | 4.20% |  | 4.20% |  |  |  |  |
Medium-term Notes, Maturing September 11, 2028 | Fixed interest rate | Debt Issuers | CAD |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  | 4.20% |  |  | 4.20%
Medium-term Notes, Maturing September 11, 2028 | Fixed interest rate | Debt Issuers | USD |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  | 4.70%
Corporate borrowings |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Non-recourse borrowings |  |  |  | $ 3,173,000,000 |  |  |  |  | 2,475,000,000 |  |
Increase (decrease) in corporate borrowings |  |  |  | 698,000,000 |  |  |  |  |  |  |
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% |  | 1.80% |  |  |  |  |
Commitment fees |  |  |  | $ 0 |  |  |  |  |  |  |
Non-recourse borrowings |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Non-recourse borrowings |  |  |  | 20,020,000,000 |  |  |  |  | 18,544,000,000 |  |
Increase in borrowings |  |  |  | 1,500,000,000 |  |  |  |  |  |  |
Non-recourse borrowings | CAD |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Non-recourse borrowings |  |  |  | 2,400,000,000 |  |  |  |  | 2,473,000,000 |  |
Non-recourse borrowings | USD |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Non-recourse borrowings |  |  |  | 7,457,000,000 |  |  |  |  | 7,801,000,000 |  |
Medium-term Notes, Maturing September 1, 2032 |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Non-recourse borrowings |  |  |  | $ 392,000,000 |  |  |  |  | $ 0 |  |
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] |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  | 2.90% |  | 2.90% |  |  |  |  |
Medium-term Notes, Maturing September 1, 2032 | Fixed interest rate | Debt Issuers | CAD |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate | 2.90% |  |  |  |  |  |  |  |  |  |
Medium-term Notes, Maturing September 1, 2032 | Fixed interest rate | Debt Issuers | USD |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate | 3.90% |  |  |  |  |  |  |  |  |  |

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