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CAPITAL STOCK (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of classes of share capital [line items] |  |
Dividends paid | $ 125 | $ 86
Common shares |  |
Disclosure of classes of share capital [line items] |  |
Number of shares issued (shares) | 1,166,577,478 |
Par value per share (in dollars per share) | $ 0 |
Preferred shares | First Preferred Shares, Series A |  |
Disclosure of classes of share capital [line items] |  |
Number of shares issued (shares) | 0 |
Number of shares authorized (shares) | 10,000,000 |
Preferred shares | First Preference Shares, Series B |  |
Disclosure of classes of share capital [line items] |  |
Number of shares issued (shares) | 0 |
Number of shares authorized (shares) | 10,000,000 |
Preferred shares | First Preferred Shares, Series C Special Voting Share |  |
Disclosure of classes of share capital [line items] |  |
Number of shares issued (shares) | 0 |
Number of shares authorized (shares) | 1 |
Preferred shares | Second Preferred Shares, Series A |  |
Disclosure of classes of share capital [line items] |  |
Number of shares issued (shares) | 0 |
Number of shares authorized (shares) | 15,000,000 |
Capital stock |  |
Disclosure of classes of share capital [line items] |  |
Dividends reinvested | $ 16 | $ 8

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