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Credit Facilities, Long-Term Debt and Lease Liabilities - Amounts Outstanding (Details) $ in Millions, $ in Millions, $ in Millions | Dec. 31, 2022 CAD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 AUD ($) | Nov. 15, 2022 CAD ($) | Dec. 31, 2021 CAD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 AUD ($) | Dec. 06, 2021 CAD ($)
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Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Carrying value | $ 3,653 |  |  |  | $ 3,267 |  |  |
Less: current portion of long-term debt | (170) |  |  |  | (837) |  |  |
Less: current portion of lease liabilities | (8) |  |  |  | (7) |  |  |
Total current long-term debt and lease liabilities | (178) |  |  |  | (844) |  |  |
Total non-current credit facilities, long-term debt and lease liabilities | 3,475 |  |  |  | 2,423 |  |  |
All Borrowings Except Finance Lease Obligations |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Carrying value | 3,518 |  |  |  | 3,167 |  |  |
Notional amount | 3,563 |  |  |  | 3,198 |  |  |
Committed syndicated bank facility |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Carrying value | 32 |  |  |  | 0 |  |  |
Notional amount | 33 |  |  |  | 0 |  |  |
Term Facility |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Carrying value | 396 |  |  |  | 0 |  |  |
Notional amount | 400 |  |  |  | 0 |  |  |
7.3% Medium term notes |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Carrying value | 110 |  |  |  | 110 |  |  |
Notional amount | 110 |  |  |  | 110 |  |  |
6.9% Medium term notes |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Carrying value | 141 |  |  |  | 141 |  |  |
Notional amount | 141 |  |  |  | 141 |  |  |
Senior notes | USD |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Notional amount |  | $ 700 |  |  |  | $ 700 |  |
7.8% Senior notes | USD |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Carrying value | 533 |  |  |  | 0 |  |  |
Notional amount | 542 |  |  |  | 0 |  |  |
6.5% Senior notes | USD |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Carrying value | 401 |  |  |  | 378 |  |  |
Notional amount | $ 407 |  |  |  | 383 |  |  |
4.5% Senior notes |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Carrying value |  |  |  | $ 400 |  |  |  |
Interest | 4.50% | 4.50% | 4.50% |  |  |  |  |
4.5% Senior notes | USD |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Carrying value | $ 0 |  |  |  | 510 |  |  |
Notional amount | 0 |  |  |  | 511 |  |  |
Melancthon Wolfe Wind LP bond |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Carrying value | 202 |  |  |  | 235 |  |  |
Notional amount | 203 |  |  |  | 237 |  |  |
New Richmond Wind LP bond |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Carrying value | 112 |  |  |  | 120 |  |  |
Notional amount | 113 |  |  |  | 121 |  |  |
Kent Hills Wind LP bond |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Carrying value | 206 |  |  |  | 221 |  |  |
Notional amount | $ 209 |  |  |  | 221 |  |  |
Interest | 4.50% | 4.50% | 4.50% |  |  |  |  |
Windrise Wind LP bond |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Carrying value | $ 170 |  |  |  | 171 |  |  |
Notional amount | 173 |  |  |  | 173 |  |  | $ 173
Interest |  |  |  |  |  |  |  | 3.41%
Pingston bond |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Carrying value | 45 |  |  |  | 45 |  |  |
Notional amount | 45 |  |  |  | 45 |  |  |
TAPC Holdings LP bond (Poplar Creek) |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Carrying value | 94 |  |  |  | 102 |  |  |
Notional amount |  |  |  |  | 104 |  |  |
TEC Hedland PTY Ltd bond | AUD |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Carrying value | 711 |  |  |  | 732 |  |  |
Notional amount | 720 |  |  |  | 742 |  |  |
TransAlta OCP LP bond |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Carrying value | 241 |  |  |  | 263 |  |  |
Notional amount | 242 |  |  |  | 265 |  |  |
Other |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Carrying value | 1 |  |  |  | 4 |  |  |
Notional amount | 1 |  |  |  | 4 |  |  |
Big Level & Antrim | USD |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Carrying value | 102 |  |  |  | 106 |  |  |
Notional amount | 108 | $ 79 |  |  | 112 | 88 |  |
Lakeswind | USD |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Carrying value | 15 |  |  |  | 18 |  |  |
Notional amount | 15 | 11 |  |  | 18 | 14 |  |
North Carolina Solar | USD |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Carrying value | 6 |  |  |  | 11 |  |  |
Notional amount | 6 | $ 5 |  |  | 11 | $ 9 |  |
South Hedland Bond | AUD |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Carrying value |  |  | $ 786 |  |  |  | $ 800 |
Finance lease obligation |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Carrying value | $ 135 |  |  |  | $ 100 |  |  |
Weighted average | Committed syndicated bank facility |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Interest | 4.70% | 4.70% | 4.70% |  | 0.00% | 0.00% | 0.00% |
Weighted average | Term Facility |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Interest | 6.50% | 6.50% | 6.50% |  | 0.00% | 0.00% | 0.00% |
Weighted average | 7.3% Medium term notes |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Interest | 7.30% | 7.30% | 7.30% |  | 7.30% | 7.30% | 7.30% |
Weighted average | 6.9% Medium term notes |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Interest | 6.90% | 6.90% | 6.90% |  | 6.90% | 6.90% | 6.90% |
Weighted average | 7.8% Senior notes | USD |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Interest | 7.80% | 7.80% | 7.80% |  | 0.00% | 0.00% | 0.00% |
Weighted average | 6.5% Senior notes | USD |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Interest | 6.50% | 6.50% | 6.50% |  | 6.50% | 6.50% | 6.50% |
Weighted average | 4.5% Senior notes | USD |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Interest | 4.50% | 4.50% | 4.50% |  | 4.50% | 4.50% | 4.50% |
Weighted average | Melancthon Wolfe Wind LP bond |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Interest | 3.80% | 3.80% | 3.80% |  | 3.80% | 3.80% | 3.80% |
Weighted average | New Richmond Wind LP bond |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Interest | 4.00% | 4.00% | 4.00% |  | 4.00% | 4.00% | 4.00% |
Weighted average | Kent Hills Wind LP bond |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Interest |  |  |  |  | 4.50% | 4.50% | 4.50% |
Weighted average | Windrise Wind LP bond |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Interest | 3.40% | 3.40% | 3.40% |  | 3.40% | 3.40% | 3.40% |
Weighted average | Pingston bond |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Interest | 3.00% | 3.00% | 3.00% |  | 3.00% | 3.00% | 3.00% |
Weighted average | TAPC Holdings LP bond (Poplar Creek) |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Interest | 8.90% | 8.90% | 8.90% |  | 4.40% | 4.40% | 4.40% |
Weighted average | TEC Hedland PTY Ltd bond | AUD |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Interest | 4.10% | 4.10% | 4.10% |  | 4.10% | 4.10% | 4.10% |
Weighted average | TransAlta OCP LP bond |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Interest | 4.50% | 4.50% | 4.50% |  | 4.50% | 4.50% | 4.50% |
Weighted average | Other |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Interest | 5.90% | 5.90% | 5.90% |  | 5.90% | 5.90% | 5.90% |
Borrowings effective interest rate | 5.98% | 5.98% | 5.98% |  |  |  |  |
Weighted average | Big Level & Antrim | USD |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Interest | 6.60% | 6.60% | 6.60% |  | 6.60% | 6.60% | 6.60% |
Weighted average | Lakeswind | USD |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Interest | 10.50% | 10.50% | 10.50% |  | 10.50% | 10.50% | 10.50% |
Weighted average | North Carolina Solar | USD |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Interest | 7.30% | 7.30% | 7.30% |  | 7.30% | 7.30% | 7.30% |

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