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STOCK-BASED COMPENSATION - Employee Stock Options (Details) shares in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) shares | Dec. 31, 2019 CAD ($) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2018 CAD ($) shares
Canada |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Number of options at January 1 (shares) | shares | 0.3 | 0.3 | 0.3 | 0.3
Number of options at December 31 (shares) | shares | 0.2 | 0.2 | 0.3 | 0.3
Average price of stock options outstanding at January 1 (in dollars per share) | $ |  | $ 13 |  | $ 13
Number of share options exercised in share-based payment arrangement | shares | (0.1) | (0.1) | 0.0 | 0.0
Weighted average exercise price of share options exercised in share-based payment arrangement | $ |  | $ 16 |  | $ 10
Average price of stock options outstanding at December 31 (in dollars per share) | $ |  | $ 10 |  | $ 13
United States |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Number of options at January 1 (shares) | shares | 0.5 | 0.5 | 0.7 | 0.7
Number of options forfeited (shares) | shares | 0.0 | 0.0 | (0.1) | (0.1)
Number of options cancelled/expired (shares) | shares | (0.4) | (0.4) | (0.1) | (0.1)
Number of options at December 31 (shares) | shares | 0.1 | 0.1 | 0.5 | 0.5
Average price of stock options outstanding at January 1 (in dollars per share) | $ | $ 37 |  | $ 40 |
Average price of options forfeited (in dollars per share) | $ | 0 |  | 34 |
Average price of options cancelled/expired (in dollars per share) | $ | 39 |  | 49 |
Average price of stock options outstanding at December 31 (in dollars per share) | $ | $ 32 |  | $ 37 |

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