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Significant partly-owned subsidiary - Selected Income and Cash Flow Information (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of subsidiaries [line items] |  |
Operating revenues | $ 22,883 | $ 23,793
Net earnings | 2,699 | 3,253
Net earnings attributable to NCI | 65 | 62
Total comprehensive income | 3,153 | 3,486
Total comprehensive income attributable to NCI | 64 | 58
Subsidiaries with material non-controlling interests |  |
Disclosure of subsidiaries [line items] |  |
Operating revenues | 754 | 878
Net earnings | 202 | 193
Net earnings attributable to NCI | 64 | 61
Total comprehensive income | 200 | 181
Total comprehensive income attributable to NCI | 63 | 58
Cash dividends paid to NCI | 53 | $ 65
CTV Specialty hedge |  |
Disclosure of subsidiaries [line items] |  |
Total comprehensive income attributable to NCI | $ 5 |

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