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Credit Facilities, Long-Term Debt, and Finance Lease Obligations - Other (Details) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |
Restricted cash (Note 22) | $ 0 | $ 30 |
Notional amount | 3,234 | 3,664 |
Property, plant and equipment (Note 17) | 6,164 | $ 6,578 | $ 6,824
Other | 5.9% Unsecured Commercial Loan Obligation due 2023 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest rate |  | 5.90% |
Non-recourse |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Restricted cash (Note 22) | 33 | $ 35 |
Non-recourse | Secured by first rate ranking charge over subsidiaries |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Notional amount | 766 | 848 |
Non-recourse | Secured by equity interests of the issuer |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Notional amount | 127 | 174 |
Renewable generation facilities |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Property, plant and equipment (Note 17) | 1,021 | 1,107 |
TransAlta OCP |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Restricted cash (Note 22) | 35 | 0 |
TransAlta OCP | Secured Debt |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Notional amount | 342 |  |
Kent Hills Wind L.P. |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Restricted cash (Note 22) | $ 31 | $ 30 |
Interest rate | 4.55% |  |

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