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Credit Facilities, Long-Term Debt, and Finance Lease Obligations - Non-Recourse Debt (Details) $ in Millions, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2018 CAD ($) | Jul. 20, 2018 CAD ($) | Dec. 31, 2017 CAD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  | 3.95%
Notional amount |  | $ 3,234 |  | $ 3,664
Borrowings |  | $ 3,267 |  | $ 3,707
Bonds issued |  |  | $ 345 |
Non-Recourse Bonds |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate |  | 4.509% |  |
Principal payment | $ 25 |  |  |
Non-Recourse Variable Rate Debt | Minimum |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate |  |  |  | 2.95%
Non-Recourse Variable Rate Debt | Maximum |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate |  |  |  | 6.26%
TransAlta OCP | Non-Recourse Bonds |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notional amount |  | $ 345 |  |
TAPC Holdings | Variable Rate Bond due 2030 | Non-recourse debt | Canadian Dollar Offered Rate |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  | 3.95%

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