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FINANCIAL RISK MANAGEMENT FINANCIAL RISK MANAGEMENT - Additional Information (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Apr. 14, 2020 | Dec. 31, 2019
Disclosure of detailed information about borrowings [line items] |  |  |
Debt in breach of asset-level financial covenants | $ 540,000,000 |  |
Percent of partnership debt in breach of asset-level financial covenants | 2.30% |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Financial assets | $ 4,305,000,000 |  | $ 3,931,000,000
Market risk |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Impact of 10% change in value of investments on Equity | 52,000,000 |  |
Impact of 10 Percent Change in Value of Investments on Profit Loss | 32,000,000 |  |
Impact of 10% change in value of investments on Comprehensive Income | 20,000,000 |  |
Marketable securities |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Financial assets | 526,000,000 |  | 142,000,000
Marketable securities | Market risk |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Financial assets | 526,000,000 |  | 142,000,000
Corporate revolving credit facility |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Credit facility, maximum borrowing capacity | 1,975,000,000 |  |
Non-recourse borrowings | 1,131,000,000 |  | 820,000,000
Letter of credit outstanding amount | 63,000,000 |  | 54,000,000
Credit facility |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Credit facility, maximum borrowing capacity | 500,000,000 |  |
Non-recourse borrowings | 0 |  | $ 0
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 |

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