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INVESTMENTS - Associates and Joint Venture Investment Impact (Details) - CAD CAD in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Current assets | CAD 2,972 | CAD 2,570
Current liabilities | (6,823) | (5,113)
Revenue | 14,143 | 13,702
Net income (loss) | 1,711 | 835
Associates | Joint ventures |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Current assets | 515 | 518
Long-term assets | 3,269 | 3,391
Current liabilities | (1,184) | (1,186)
Long-term liabilities | (825) | (1,082)
Total net assets | 1,775 | 1,641
Our share of net assets | 927 | 834
Revenue | 1,706 | 1,596
Expenses | (1,686) | (2,027)
Net income (loss) | 20 | (431)
Our share of net income (loss) | CAD 14 | CAD (216)

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