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SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 CAD ($) reporting_unit | Dec. 31, 2017 CAD ($) | Dec. 31, 2016 CAD ($)
Cash and Cash Equivalents [Line Items] |  |  |
Net cash (used in) provided by financing activities | $ (7,503) | $ 3,476 | $ 840
Number of reporting units | reporting_unit | 2 |  |
Restatement Adjustment |  |  |
Cash and Cash Equivalents [Line Items] |  |  |
Net cash (used in) provided by financing activities |  |  | $ 300

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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 + Details
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