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FINANCIAL RISK MANAGEMENT FINANCIAL RISK MANAGEMENT - Additional Information (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of detailed information about borrowings [line items] |  |
Letter of credit outstanding amount | $ 47,000,000 | $ 106,000,000
Financial assets | 3,056,000,000 | 2,134,000,000
Corporate revolving credit facility |  |
Disclosure of detailed information about borrowings [line items] |  |
Credit facility, maximum borrowing capacity | 1,975,000,000.000 |
Non-recourse borrowings | 510,000,000 | 789,000,000
Credit facility |  |
Disclosure of detailed information about borrowings [line items] |  |
Credit facility, maximum borrowing capacity | 500,000,000 |
Non-recourse borrowings | 0 | 0
Marketable securities |  |
Disclosure of detailed information about borrowings [line items] |  |
Financial assets | 173,000,000 | $ 85,000,000
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 | 17,000,000 |
Impact of 10 Percent Change in Value of Investments on Profit Loss | 13,000,000 |
Impact of 10% change in value of investments on Comprehensive Income | $ 4,000,000 |

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