SUPPLEMENTAL CASH FLOW INFORMATION - Changes in non-cash operating working capital items (Details) - CAD CAD in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Cash Flow Statement [Abstract]
Accounts receivable	CAD (161)	CAD (141)
Inventories	2	3
Other current assets	17	(12)
Accounts payable and accrued liabilities	9	182
Unearned revenue	(21)	(18)
Total change in non-cash operating working capital items	CAD (154)	CAD 14

Adjustments for decrease (increase) in inventories to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Inventories; Profit (loss)]

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Adjustments for decrease (increase) in other current assets to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Other current assets; Profit (loss)]

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Adjustments for decrease (increase) in trade accounts receivable to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Profit (loss)]

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Adjustments for increase (decrease) in deferred income to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Deferred income; Profit (loss)]

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Adjustments for increase (decrease) in trade and other payables to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Trade and other payables; Profit (loss)]

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The increase (decrease) in working capital.

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Cash Flow Statement [Abstract]

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