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Risk Management Activities - Additional Information (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 CAD ($) agency | Dec. 31, 2022 CAD ($) | Dec. 31, 2021 CAD ($) | Dec. 31, 2023 USD ($) agency | Dec. 31, 2022 USD ($)
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Floating interest rates | 14.00% | 1500.00% |  | 14.00% | 1500.00%
Outstanding credit facilities | $ (46,000,000) | $ 449,000,000 | $ (114,000,000) |  |
Target percentage, four year period | 6000.00% |  |  |  |
Sensitivity analysis average | $ 0.03 | 0.03 | 0.03 |  |
Maximum credit exposure | $ 23,000,000 | 64,000,000 |  |  |
Number of credit rating agency | agency | 1 |  |  | 1 |
Debt maturing | $ 400,000,000 |  |  |  |
After-tax gain reclassified from AOCI to net earnings | 102,000,000 | (460,000,000) | (222,000,000) |  |
Net unrealized gain | 44,000,000 | 384,000,000 | 97,000,000 |  |
Gains on foreign exchange and other derivatives | 11,000,000 | 20,000,000 | 6,000,000 |  |
Unrealised Gains On Change In Fair Value Of Derivatives | (27,000,000) |  | (4,000,000) |  |
Unrealised loss on foreign exchange and other derivatives |  | 11,000,000 |  |  |
Net realised loss on change in fair value of derivatives | 16,000,000 |  |  |  |
Net realized gains on foreign exchange and other derivatives |  | 31,000,000 | 2,000,000 |  |
Collateral provided | 145,000,000 | 304,000,000 |  |  |
Cash collateral | 9,000,000 | 260,000,000 |  |  |
Additional collateral requirement | $ 154,000,000 | 594,000,000 |  |  |
Number Of Below Investment Grade Ratings From Credit Rating Agencies | agency | 2 |  |  | 2 |
Trade and other receivables | $ 807,000,000 | 1,589,000,000 |  |  |
Recourse Debt |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Debt maturing | 411,000,000 |  |  |  |
Letter of credit |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Collateral posted on derivative liabilities | 392,000,000 | 820,000,000 |  |  |
Surety Bonds |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Collateral posted on derivative liabilities | 19,000,000 | 6,000,000 |  |  |
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 | (89,000,000) |  |  |  |
Within one year | Lease Incentive Receivable |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Trade and other receivables | 12,000,000 |  |  |  |
Long-term debt | Net investment hedges |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Notional amount |  |  |  | $ 370 | $ 370
Interest rate swap contract [member] |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Outstanding credit facilities | 400,000,000 | 433,000,000 |  |  |
Commodity Price Risk - Proprietary Trading |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Value at risk | 4,000,000 | 4,000,000 | 2,000,000 |  |
Commodity Price Risk - Generation |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Value at risk | 23,000,000 | 97,000,000 | 33,000,000 |  |
Commodity Price Risk - Generation - Mark To Market Value |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Value at risk | 16,000,000 | 45,000,000 | $ 34,000,000 |  |
Interest rate risk | TAPC Holdings LP bond (Poplar Creek) |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Notional amount | 86,000,000 | $ 95,000,000 |  |  |
Commodity risk management | Cash flow hedges |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Value at risk | $ 0 |  |  |  |

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