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Capital Disclosures (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |
Long-term debt, net | $ 20,843 | $ 20,522 |
Total shareholders’ equity | $ 34,991 | $ 31,974 | $ 31,653
Debt to book capitalization | 37.00% | 39.00% |
Bottom of range |  |  |
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |
Debt to book capitalization | 25.00% |  |
Top of range |  |  |
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |
Debt to book capitalization | 45.00% |  |
Debt to book capitalization ratio | 65.00% |  |

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