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Risk Management Activities - Additional Information (Details) $ in Millions |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 26, 2022 USD ($) | Oct. 25, 2022 USD ($) | Dec. 31, 2022 CAD ($) agency agreement | Dec. 31, 2021 CAD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2022 USD ($) agency | Dec. 31, 2021 USD ($)
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Floating interest rates |  |  | 15.00% | 3.00% |  | 15.00% | 3.00%
Outstanding credit facilities |  |  | $ 449,000,000 | $ (114,000,000) | $ (106,000,000) |  |
Target percentage, four year period |  |  | 60.00% |  |  |  |
Target percentage, current period |  |  | 90.00% |  |  |  |
Target percentage, next year |  |  | 70.00% |  |  |  |
Target percentage, third year |  |  | 50.00% |  |  |  |
Target percentage, fourth year |  |  | 30.00% |  |  |  |
Sensitivity analysis average |  |  | $ 0.03 | 0.03 | 0.03 |  |
Maximum credit exposure |  |  | $ 64,000,000 | 37,000,000 |  |  |
Number of credit rating agency | agency |  |  | 1 |  |  | 1 |
Debt maturing |  |  | $ 839,000,000 |  |  |  |
After-tax gain reclassified from AOCI to net earnings |  |  | (460,000,000) | (222,000,000) | (90,000,000) |  |
Net unrealized gain |  |  | 384,000,000 | 97,000,000 | 43,000,000 |  |
Gains on foreign exchange and other derivatives |  |  | 20,000,000 | 6,000,000 | 11,000,000 |  |
Unrealised Gains On Change In Fair Value Of Derivatives |  |  | 11,000,000 | 4,000,000 |  |  |
Unrealised loss on foreign exchange and other derivatives |  |  |  |  | (2,000,000) |  |
Net realized gains on foreign exchange and other derivatives |  |  | 31,000,000 | 2,000,000 | 13,000,000 |  |
Collateral provided |  |  | 304,000,000 | 55,000,000 |  |  |
Cash collateral |  |  | 260,000,000 | 18,000,000 |  |  |
Additional collateral requirement |  |  | $ 656,000,000 | 120,000,000 |  |  |
Number Of Below Investment Grade Ratings From Credit Rating Agencies | agency |  |  | 2 |  |  | 2 |
Recourse Debt |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Debt maturing |  |  | $ 400,000,000 |  |  |  |
Letter of credit |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Collateral posted on derivative liabilities |  |  | 820,000,000 | 356,000,000 |  |  |
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 |  |  | $ (208,000,000) |  |  |  |
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 |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Number of agreements | agreement |  |  | 2 |  |  |  |
Outstanding credit facilities |  |  | $ 433,000,000 | 0 |  |  |
Bond Lock Agreement |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  | $ 150
Commodity Price Risk - Proprietary Trading |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Value at risk |  |  | 4,000,000 | 2,000,000 | 1,000,000 |  |
Commodity Price Risk - Generation |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Value at risk |  |  | 97,000,000 | 33,000,000 | 12,000,000 |  |
Commodity Price Risk - Generation - Mark To Market Value |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Value at risk |  |  | 54,000,000 | 51,000,000 | 15,000,000 |  |
Commodity Price Risk - Generation - virtual PPAs |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Value at risk |  |  | 26,000,000 | 14,000,000 | $ 3,000,000 |  |
Interest rate risk | Interest rate swap |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Notional amount | $ 100 | $ 100 |  |  |  | $ 150 |
Interest rate risk | Interest rate swap | Fixed Blended Rate |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Fixed interest rate | 470.00% | 470.00% |  |  |  |  |
Interest rate risk | TAPC Holdings LP bond (Poplar Creek) |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Notional amount |  |  | 95,000,000 | $ 104,000,000 |  |  |
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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