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CAPITAL STOCK (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of classes of share capital [line items] |  |
Dividends recognised as distributions to owners of parent | $ 547 | $ 218
Dividends paid, classified as financing activities | 547 | 548
Dividends reinvested | $ 0 | 0
Common shares |  |
Disclosure of classes of share capital [line items] |  |
Number of shares issued | 1,778,189,894 |
Par value per share (in dollars per share) | $ 0 |
Number of shares issued | 1,778,189,894 |
Capital stock |  |
Disclosure of classes of share capital [line items] |  |
Dividends reinvested | $ 4 | $ 20

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