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Risk Management Activities - Narrative (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 CAD ($) agency | Dec. 31, 2023 CAD ($) | Dec. 31, 2022 CAD ($) | Dec. 31, 2024 USD ($) agency | Dec. 31, 2023 USD ($)
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Floating interest rates | 23.00% | 14.00% |  | 23.00% | 14.00%
Net increase (decrease) in borrowings under credit facilities | $ 143,000,000 | $ (46,000,000) | $ 449,000,000 |  |
Target percentage, four year period | 60.00% |  |  |  |
Sensitivity analysis average | $ 0.03 | 0.03 | 0.03 |  |
Maximum credit exposure | $ 77,000,000 | 23,000,000 |  |  |
Number of credit rating agency | agency | 1 |  |  | 1 |
Number of below investment grade ratings from credit rating agencies | agency | 2 |  |  | 2 |
Debt maturing | $ 400,000,000 |  |  |  |
After-tax gain reclassified from AOCI to net earnings | 196,000,000 | 102,000,000 | (460,000,000) |  |
Reclassification adjustment | 4,000,000 |  |  |  |
Net unrealized loss | 7,000,000 | 44,000,000 | 384,000,000 |  |
Losses on change in fair value of derivatives | 63,000,000 |  |  |  |
Gains on foreign exchange and other derivatives |  | 11,000,000 | 20,000,000 |  |
Unrealised loss on foreign exchange and other derivatives | (36,000,000) |  | (11,000,000) |  |
Unrealised gains on foreign exchange and other derivatives |  | 27,000,000 |  |  |
Net realised loss on change in fair value of derivatives | (27,000,000) | (16,000,000) |  |  |
Net realized gains on foreign exchange and other derivatives |  |  | 31,000,000 |  |
Collateral provided | 124,000,000 | 145,000,000 |  |  |
Cash collateral | 9,000,000 | 9,000,000 |  |  |
Additional collateral requirement | 128,000,000 | 154,000,000 |  |  |
Surety Bonds |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Collateral posted on derivative liabilities | 21,000,000 | 19,000,000 |  |  |
Letter of credit |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Collateral posted on derivative liabilities | 424,000,000 | 392,000,000 |  |  |
Within one year |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
After-tax gain reclassified from AOCI to net earnings | (28,000,000) |  |  |  |
Recourse Debt |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Debt maturing | 666,000,000 |  |  |  |
Interest rate swap contract |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Net increase (decrease) in borrowings under credit facilities | 545,000,000 | 400,000,000 |  |  |
Net investment hedges | Long-term debt |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Notional amount |  |  |  | $ 300 | $ 370
Commodity Price Risk - Proprietary Trading |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Value at risk | 3,000,000 | 4,000,000 | 4,000,000 |  |
Commodity Price Risk - Generation |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Value at risk | 8,000,000 | 23,000,000 | 97,000,000 |  |
Commodity Price Risk - Generation - Mark To Market Value |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Value at risk | 13,000,000 | $ 16,000,000 | $ 45,000,000 |  |
Commodity risk management | Cash flow hedges |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Value at risk | 0 |  |  |  |
Interest rate risk |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Floating interest rates |  | 14.00% |  |  | 14.00%
Interest rate risk | Interest rate swap contract |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Notional amount | $ 190,000,000 |  |  |  |
Variable interest rate | 0.321% |  |  |  |
Weighted average interest rate | 1.64% |  |  |  |
Interest rate risk | TAPC Holdings LP bond (Poplar Creek) |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Notional amount | $ 76,000,000 | $ 86,000,000 |  |  |

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