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FINANCIAL RISK MANAGEMENT FINANCIAL RISK MANAGEMENT - Additional Information (Details) - USD ($) | 2 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 13, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of detailed information about borrowings [line items] |  |  |
Financial assets |  | $ 2,134,000,000 | $ 2,412,000,000
Subsidiary and corporate borrowings |  | 10,164,000,000 | 8,326,000,000
Letter of credit outstanding amount |  | 106,000,000 | 46,000,000
Credit facility |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Credit facility, maximum borrowing capacity |  | 500,000,000 |
Subsidiary and corporate borrowings |  | 0 | 0
Corporate revolving credit facility |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Credit facility, maximum borrowing capacity |  | 1,975,000,000.000 |
Subsidiary and corporate borrowings |  | 789,000,000 | 0
Letter of credit outstanding amount |  | 106,000,000 | 46,000,000
Marketable securities |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Financial assets |  | 85,000,000 | $ 3,000,000
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 |  | 9,000,000 |
Impact of 10% change in value of investments on Comprehensive Income |  | $ 9,000,000 |
Subsequent Event |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Cancellation of letters of credit | $ 59,000,000 |  |
Subsequent Event | Credit facility |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Subsidiary and corporate borrowings | $ 400,000,000 |  |

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