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Credit Facilities, Long-Term Debt and Lease Liabilities - Amounts Outstanding (Details) $ in Millions, $ in Millions, $ in Millions | Dec. 31, 2024 CAD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2024 AUD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 AUD ($)
--- | --- | --- | --- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Carrying value | $ 3,808 |  |  | $ 3,466 |  |
Less: current portion of long-term debt | (567) |  |  | (526) |  |
Less: current portion of lease liabilities | (5) |  |  | (6) |  |
Total current long-term debt and lease liabilities | (572) |  |  | (532) |  |
Total non-current credit facilities, long-term debt and lease liabilities | 3,236 |  |  | 2,934 |  |
Trade and other current receivables | (767) |  |  | (807) |  |
Committed syndicated bank facility |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Carrying value | 143 |  |  | 0 |  |
Notional amount | 145 |  |  | 0 |  |
Term Facility |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Carrying value | 400 |  |  | 397 |  |
Notional amount | 400 |  |  | 400 |  |
Heartland term facility |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Carrying value | 224 |  |  | 0 |  |
Notional amount | 224 |  |  | 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 |  |
7.8% Senior notes | USD |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Carrying value | 569 |  |  | 520 |  |
Notional amount | 575 |  |  | 528 |  |
6.5% Senior notes | USD |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Carrying value | 426 |  |  | 391 |  |
Notional amount | 431 |  |  | 396 |  |
Melancthon Wolfe Wind LP bond |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Carrying value | 133 |  |  | 168 |  |
Notional amount | 134 |  |  | 169 |  |
New Richmond Wind LP bond |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Carrying value | 93 |  |  | 103 |  |
Notional amount | 94 |  |  | 104 |  |
Kent Hills Wind LP bond |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Carrying value | 179 |  |  | 193 |  |
Notional amount | $ 182 |  |  | 196 |  |
Interest | 4.50% | 4.50% | 4.50% |  |  |
Windrise Wind LP bond |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Carrying value | $ 157 |  |  | 164 |  |
Notional amount | 160 |  |  | 167 |  |
Pingston bond |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Carrying value | 39 |  |  | 39 |  |
Notional amount | 39 |  |  | 39 |  |
TAPC Holdings LP bond (Poplar Creek) |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Carrying value | 75 |  |  | 85 |  |
Notional amount |  |  |  | 86 |  |
TEC Hedland PTY Ltd bond(5) | AUD |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Carrying value | 675 |  |  | 691 |  |
Notional amount | 683 |  |  | 699 |  |
TransAlta OCP LP bond |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Carrying value | 192 |  |  | 217 |  |
Notional amount | 193 |  |  | 218 |  |
Big Level & Antrim | USD |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Carrying value | 90 |  |  | 91 |  |
Notional amount | 94 | $ 65 |  | 97 | $ 73 |
Lakeswind | USD |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Carrying value | 7 |  |  | 10 |  |
Notional amount | 7 | 5 |  | 10 | 8 |
North Carolina Solar | USD |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Carrying value | 4 |  |  | 3 |  |
Notional amount | 4 | 3 |  | 3 | 2 |
Total long-term debt |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Carrying value | 3,657 |  |  | 3,323 |  |
Notional amount | 3,692 |  |  | 3,363 |  |
Lease liabilities |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Carrying value | $ 151 |  |  | $ 143 |  |
Senior notes | USD |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Notional amount |  | $ 700 |  |  | $ 700 |
South Hedland Bond | AUD |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Carrying value |  |  | $ 761 |  |  | $ 773
Weighted average | Committed syndicated bank facility |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Interest | 5.30% | 5.30% | 5.30% | 0.00% | 0.00% | 0.00%
Weighted average | Term Facility |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Interest | 5.60% | 5.60% | 5.60% | 7.40% | 7.40% | 7.40%
Weighted average | Heartland term facility |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Interest | 6.60% | 6.60% | 6.60% | 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% | 7.80% | 7.80% | 7.80%
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 | 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 | 6.20% | 6.20% | 6.20% | 6.20% | 6.20% | 6.20%
Weighted average | TAPC Holdings LP bond (Poplar Creek) |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Interest | 8.30% | 8.30% | 8.30% | 9.40% | 9.40% | 9.40%
Weighted average | TEC Hedland PTY Ltd bond(5) | 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 | 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%
Weighted average | Other |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings effective interest rate | 5.98% | 5.98% | 5.98% |  |  |

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