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FINANCIAL INSTRUMENTS - Financial instrument sensitivities (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2017 CAD ($)
Interest rate risk |  |
Disclosure of detailed information about financial instruments [line items] |  |
Increase (decrease) to net earnings |  | $ (42)
Increase (decrease) to net earnings |  | 42
(Increase) decrease to other comprehensive loss |  | (16)
(Increase) decrease to other comprehensive loss |  | $ 19
Increase interest rate 1% | 1.00% | 1.00%
Decrease interest rate 1% | 1.00% | 1.00%
Foreign currency exchange rate risk |  |
Disclosure of detailed information about financial instruments [line items] |  |
Increase (decrease) to net earnings |  | $ (105)
Increase (decrease) to net earnings |  | 101
(Increase) decrease to other comprehensive loss |  | 0
(Increase) decrease to other comprehensive loss |  | $ 0
Increase exchange rate by US$0.01 | $ 0.01 |
Decrease exchange rate by US$0.01 | $ 0.01 |

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