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SIGNIFICANT ACCOUNTING POLICIES (Details) - CAD CAD in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |
Revenue | CAD 14,143 | CAD 13,702 |
Operating expenses: |  |  |
Operating costs | 8,825 | 8,671 |
Income before income tax expense | 2,346 | 1,159 |
Income tax expense | 635 | 324 |
Net income (loss) | 1,711 | 835 |
Current assets: |  |  |
Accounts receivable | 2,041 | 1,949 |
Inventories | 313 | 315 |
Other current assets | 197 | 215 |
Total current assets | 2,972 | 2,570 |
Other long-term assets | 82 | 98 |
Total assets | 28,863 | 28,342 |
Current liabilities: |  |  |
Current portion of provisions | 4 | 134 |
Unearned revenue | 346 | 367 |
Total current liabilities | 6,823 | 5,113 |
Deferred tax liabilities | 2,206 | 1,917 |
Total liabilities | 22,516 | 23,073 |
Shareholders’ equity | 6,347 | 5,269 | CAD 5,636
Total liabilities and shareholders’ equity | 28,863 | 28,342 |
As reported |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |
Revenue | 14,100 |  |
Operating expenses: |  |  |
Operating costs | 8,800 |  |
Other non-operating costs | 3,000 |  |
Income before income tax expense | 2,300 |  |
Income tax expense | 600 |  |
Net income (loss) | 1,700 |  |
Current assets: |  |  |
Accounts receivable | 2,000 | 1,900 |
Inventories | 300 | 300 |
Current portion of contract assets | 0 | 0 |
Other current assets | 200 | 200 |
Remainder of current assets | 500 | 200 |
Total current assets | 3,000 | 2,600 |
Contract assets | 0 | 0 |
Other long-term assets | 100 | 100 |
Remainder of long-term assets | 25,800 | 25,600 |
Total assets | 28,900 | 28,300 |
Current liabilities: |  |  |
Current portion of provisions | 0 | 100 |
Unearned revenue | 300 | 400 |
Remainder of current liabilities | 6,500 | 4,600 |
Total current liabilities | 6,800 | 5,100 |
Deferred tax liabilities | 2,200 | 1,900 |
Remainder of long-term liabilities | 13,500 | 16,000 |
Total liabilities | 22,500 | 23,000 |
Shareholders’ equity | 6,400 | 5,300 |
Total liabilities and shareholders’ equity | 28,900 | 28,300 |
Estimated effect of transition |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |
Revenue | 200 |  |
Operating expenses: |  |  |
Operating costs | 100 |  |
Other non-operating costs | 0 |  |
Income before income tax expense | 200 |  |
Income tax expense | 100 |  |
Net income (loss) | 200 |  |
Current assets: |  |  |
Accounts receivable | 100 | 100 |
Inventories | 100 | 100 |
Current portion of contract assets | 800 | 700 |
Other current assets | 200 | 200 |
Remainder of current assets | 0 | 0 |
Total current assets | 1,100 | 1,000 |
Contract assets | 400 | 400 |
Other long-term assets | 100 | 100 |
Remainder of long-term assets | 0 | 0 |
Total assets | 1,500 | 1,400 |
Current liabilities: |  |  |
Current portion of provisions | 100 | 100 |
Unearned revenue | 100 | 100 |
Remainder of current liabilities | 0 | 0 |
Total current liabilities | 100 | 100 |
Deferred tax liabilities | 400 | 400 |
Remainder of long-term liabilities | 0 | 0 |
Total liabilities | 500 | 500 |
Shareholders’ equity | 1,000 | 900 |
Total liabilities and shareholders’ equity | 1,500 | 1,400 |
Subsequent to transition |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |
Revenue | 14,300 |  |
Operating expenses: |  |  |
Operating costs | 8,800 |  |
Other non-operating costs | 3,000 |  |
Income before income tax expense | 2,500 |  |
Income tax expense | 600 |  |
Net income (loss) | 1,900 |  |
Current assets: |  |  |
Accounts receivable | 2,000 | 1,900 |
Inventories | 400 | 400 |
Current portion of contract assets | 800 | 700 |
Other current assets | 400 | 400 |
Remainder of current assets | 500 | 200 |
Total current assets | 4,100 | 3,600 |
Contract assets | 400 | 400 |
Other long-term assets | 100 | 100 |
Remainder of long-term assets | 25,800 | 25,600 |
Total assets | 30,400 | 29,700 |
Current liabilities: |  |  |
Current portion of provisions | 100 | 200 |
Unearned revenue | 300 | 400 |
Remainder of current liabilities | 6,500 | 4,600 |
Total current liabilities | 6,900 | 5,200 |
Deferred tax liabilities | 2,600 | 2,300 |
Remainder of long-term liabilities | 13,500 | 16,000 |
Total liabilities | 23,000 | 23,500 |
Shareholders’ equity | 7,400 | 6,200 |
Total liabilities and shareholders’ equity | CAD 30,400 | CAD 29,700 |

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