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Long-Term Debt - Schedule of Debt Repayments (Details) - CAD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings	$ 21,453	$ 20,982
Gross carrying amount
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings	21,560	$ 21,090
Gross carrying amount | 2021
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings	1,343
Gross carrying amount | 2022
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings	4,887
Gross carrying amount | 2023
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings	4,383
Gross carrying amount | 2024
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings	1,138
Gross carrying amount | 2025
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings	1,530
Gross carrying amount | Thereafter
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings	$ 8,279

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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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