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LEASES - OPERATING LEASE COMMITMENTS (Details) - CAD ($) $ in Millions | Dec. 31, 2019 | Jan. 01, 2019
--- | --- | ---
Leases [Abstract] |  |
2020 | $ 128 |
2021 | 99 |
2022 | 94 |
2023 | 84 |
2024 | 79 |
Thereafter | 588 |
Total undiscounted lease payments | 1,072 |
Less imputed interest | (289) |
Total operating lease liabilities | $ 783 | $ 856

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