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LONG-TERM INVESTMENTS - Summary of Combined Financial Information (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income statement information |  |  |
Operating revenues | $ 19,217 | $ 16,213 | $ 4,102
Operating expenses | 15,634 | 13,197 | 3,344
Earnings/(loss) | 2,954 | 2,728 | 641
Earnings attributable to controlling interests | 1,382 | 1,262 | 469
Balance sheet information |  |  |
Current assets | 3,289 | 3,538 |
Non-current assets | 49,116 | 45,026 |
Current liabilities | 5,536 | 3,454 |
Non-current liabilities | 15,875 | 13,595 |
Noncontrolling interests | 3,479 | 3,191 |
Seaway |  |  |
Income statement information |  |  |
Operating revenues | 966 | 959 | 938
Operating expenses | 212 | 286 | 293
Earnings/(loss) | 646 | 672 | 643
Earnings attributable to controlling interests | 323 | 336 | 322
Balance sheet information |  |  |
Current assets | 113 | 106 |
Non-current assets | 3,585 | 3,329 |
Current liabilities | 123 | 143 |
Non-current liabilities | 16 | 13 |
Noncontrolling interests | 0 | 0 |
Other |  |  |
Income statement information |  |  |
Operating revenues | 18,251 | 15,254 | 3,164
Operating expenses | 15,422 | 12,911 | 3,051
Earnings/(loss) | 2,308 | 2,056 | (2)
Earnings attributable to controlling interests | 1,059 | 926 | $ 147
Balance sheet information |  |  |
Current assets | 3,176 | 3,432 |
Non-current assets | 45,531 | 41,697 |
Current liabilities | 5,413 | 3,311 |
Non-current liabilities | 15,859 | 13,582 |
Noncontrolling interests | $ 3,479 | $ 3,191 |

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