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Credit Facilities, Long-Term Debt, and Finance Lease Obligations - Credit Facilities (Details) $ in Millions, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 CAD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2016 CAD ($) | Dec. 31, 2015 CAD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Line of credit facility, cancelled capacity |  | $ 200 |  |  |
Notional amount | $ 3,234 |  | $ 3,664 |  |
Borrowings | 3,267 |  | 3,707 |  |
Cash and cash equivalents | 89 |  | 314 | $ 305 | $ 54
Restricted cash (Note 22) | 0 |  | 30 |  |
Restricted cash (Note 22) | 66 |  | 0 |  |
Syndicated Bank Credit Facility [Member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Maximum borrowing capacity under line of credit | 1,250 |  |  |  |
Committed Bilateral Credit Facilities Expiring In 2019 [Member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Maximum borrowing capacity under line of credit | 240 |  |  |  |
Committed credit facilities |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Maximum borrowing capacity under line of credit | 500 |  |  |  |
Credit Facility Cancelled In 2017 [Member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Maximum borrowing capacity under line of credit | 350 |  |  |  |
Credit facilities | Committed credit facilities |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Maximum borrowing capacity under line of credit | 2,000 |  | 2,000 |  |
Undrawn borrowing capacity under line of credit | 900 |  | 1,400 |  |
Actual drawings on borrowings | 339 |  | 27 |  |
Long-term Line Of Credit | 1,100 |  | 627 |  |
Letter of credit | Committed credit facilities |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Long-term Line Of Credit | 720 |  | 677 |  |
Corporation and TransAlta Renewables | Syndicated Bank Credit Facility [Member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Maximum borrowing capacity under line of credit | 1,750 |  | 1,500 |  |
Line of credit facility, increase (decrease) | 250 |  |  |  |
TransAlta Renewables | Syndicated Bank Credit Facility [Member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Maximum borrowing capacity under line of credit | 500 |  | 500 |  |
TransAlta OCP |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Restricted cash (Note 22) | 35 |  | 0 |  |
Restricted cash (Note 22) | $ 27 |  | $ 0 |  |

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