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Leases - Disclosure of Right-Of-Use Assets (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Property, plant and equipment | $ 27,513 | $ 27,636 | $ 27,101
Discontinued operations |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Property, plant and equipment | 484 |  |
Gross carrying amount |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Property, plant and equipment | 79,198 | 77,363 | 74,340
Additions | 4,732 | 4,769 |
Acquired through business combinations | 7 | 41 |
Gross carrying amount | Discontinued operations |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Discontinued operations | (631) | 11 |
ACCUMULATED DEPRECIATION |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Property, plant and equipment | (51,685) | (49,727) | (47,239)
ACCUMULATED DEPRECIATION | Discontinued operations |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Discontinued operations | (147) | 37 |
Right-of-use assets |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Property, plant and equipment | 4,126 | 4,424 | 4,204
Right-of-use assets | Gross carrying amount |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Property, plant and equipment | 6,685 | 6,542 | 5,782
Additions | 670 | 1,038 |
Transfers | (362) | (233) |
Acquired through business combinations | 4 | 8 |
Lease terminations | (30) | (50) |
Impairment losses recognized in earnings | (10) | (5) |
Right-of-use assets | Gross carrying amount | Discontinued operations |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Discontinued operations | (129) | (2) |
Right-of-use assets | ACCUMULATED DEPRECIATION |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Property, plant and equipment | (2,559) | (2,118) | (1,578)
Transfers | (199) | (111) |
Lease terminations | (8) | (25) |
Depreciation | 671 | 670 |
Right-of-use assets | ACCUMULATED DEPRECIATION | Discontinued operations |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Discontinued operations | (23) | (6) |
Right-of-use assets | NETWORK INFRASTRUCTURE AND EQUIPMENT |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Property, plant and equipment | 2,217 | 2,308 | 2,287
Right-of-use assets | NETWORK INFRASTRUCTURE AND EQUIPMENT | Gross carrying amount |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Property, plant and equipment | 3,690 | 3,609 | 3,329
Additions | 470 | 526 |
Transfers | (360) | (233) |
Acquired through business combinations | 0 | 0 |
Lease terminations | (20) | (12) |
Impairment losses recognized in earnings | (1) | (2) |
Right-of-use assets | NETWORK INFRASTRUCTURE AND EQUIPMENT | Gross carrying amount | Discontinued operations |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Discontinued operations | (8) | (1) |
Right-of-use assets | NETWORK INFRASTRUCTURE AND EQUIPMENT | ACCUMULATED DEPRECIATION |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Property, plant and equipment | (1,473) | (1,301) | (1,042)
Transfers | (199) | (111) |
Lease terminations | (2) | (3) |
Depreciation | 377 | 372 |
Right-of-use assets | NETWORK INFRASTRUCTURE AND EQUIPMENT | ACCUMULATED DEPRECIATION | Discontinued operations |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Discontinued operations | (4) | (1) |
Right-of-use assets | LAND AND BUILDINGS |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Property, plant and equipment | 1,909 | 2,116 | 1,917
Right-of-use assets | LAND AND BUILDINGS | Gross carrying amount |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Property, plant and equipment | 2,995 | 2,933 | 2,453
Additions | 200 | 512 |
Transfers | (2) | 0 |
Acquired through business combinations | 4 | 8 |
Lease terminations | (10) | (38) |
Impairment losses recognized in earnings | (9) | (3) |
Right-of-use assets | LAND AND BUILDINGS | Gross carrying amount | Discontinued operations |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Discontinued operations | (121) | (1) |
Right-of-use assets | LAND AND BUILDINGS | ACCUMULATED DEPRECIATION |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Property, plant and equipment | (1,086) | (817) | $ (536)
Transfers | 0 | 0 |
Lease terminations | (6) | (22) |
Depreciation | 294 | 298 |
Right-of-use assets | LAND AND BUILDINGS | ACCUMULATED DEPRECIATION | Discontinued operations |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Discontinued operations | $ (19) | $ (5) |

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