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LONG-TERM DEBT - Schedule of Debt Repayments (Details) - CAD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings	$ 20,623	$ 22,458
Gross carrying amount
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings	20,742	$ 22,597
Gross carrying amount | 2019
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings	1,141
Gross carrying amount | 2020
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings	5,996
Gross carrying amount | 2021
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings	1,444
Gross carrying amount | 2022
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings	1,003
Gross carrying amount | 2023
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings	1,365
Gross carrying amount | Thereafter
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings	$ 9,793

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- Definition

The amount of outstanding funds that the entity is obligated to repay.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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