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FV Measurements (Tables)	12 Months Ended
	Dec. 31, 2023
FV Measurements [Abstract]
Classification of Fair Value of Derivatives	As at December 31, 2023 millions of dollars Level 1 Level 2 Level 3 Total Assets Regulatory deferral:  Commodity swaps and forwards $ 7 $ 6 $ - $ 13  FX forwards - 3 - 3 7 9 - 16 HFT derivatives:  Power swaps and physical contracts (5) 23 - 18  Natural gas swaps, futures, forwards, physical   contracts and related transportation 42 108 34 184 37 131 34 202 Other derivatives:  FX forwards - 18 - 18  Equity derivatives  4 - - 4 4 18 - 22 Total assets 48 158 34 240 Liabilities Regulatory deferral:  Commodity swaps and forwards 43 30 - 73  FX forwards - 3 - 3 43 33 - 76 HFT derivatives:  Power swaps and physical contracts - 24 - 24  Natural gas swaps, futures, forwards and physical   contracts 13 19 365 397 13 43 365 421 Other derivatives:  FX forwards - 7 - 7 - 7 - 7 Total liabilities 56 83 365 504 Net assets (liabilities)  $ (8) $ 75 $ (331) $ (264) As at December 31, 2022 millions of dollars Level 1 Level 2 Level 3 Total Assets Regulatory deferral:  Commodity swaps and forwards $ 120 $ 48 $ - $ 168  FX forwards - 18 - 18  Physical natural gas purchases and sales - - 52 52 120 66 52 238 HFT derivatives:  Power swaps and physical contracts 9 31 4 44  Natural gas swaps, futures, forwards, physical   contracts and related transportation 3 72 34 109 12 103 38 153 Other derivatives:  FX forwards - 5 - 5 Total assets 132 174 90 396 Liabilities Regulatory deferral:  Commodity swaps and forwards 15 9 - 24  FX forwards - 1 - 1 15 10 - 25 HFT derivatives:  Power swaps and physical contracts 2 28 1 31  Natural gas swaps, futures, forwards and physical   contracts 51 118 825 994 53 146 826 1,025 Other derivatives:  FX forwards - 23 - 23  Equity derivatives 5 - - 5 Total liabilities 73 179 826 1,078 Net assets (liabilities) $ 59 $ (5) $ (736) $ (682)
Change in Fair Value of Level 3 Financial Assets	The change in the FV of the Level 3 financial assets for the year ended December 31, 2023 was as follows: Regulatory Deferral HFT Derivatives Physical natural Natural  millions of dollars gas purchases Power  gas Total Balance, January 1, 2023 $ 52 $ 4 $ 34 $ 90 Realized gains (losses) included in fuel for generation and purchased power (49) - - (49) Unrealized gains (losses) included in regulatory assets and liabilities (3) - - (3) Total realized and unrealized gains (losses) included in non-regulated operating revenues - (4) - (4) Balance, December 31, 2023 $ - $ - $ 34 $ 34
Change in Fair Value of Level 3 Financial Liabilities	The change in the FV of the Level 3 financial liabilities for the year ended December 31, 2023 was as follows:  HFT Derivatives Natural millions of dollars Power  gas Total Balance, January 1, 2023 $ 1 $ 825 $ 826 Total realized and unrealized gains included in non- regulated operating revenues (1) (460) (461) Balance, December 31, 2023  $ - $ 365 $ 365
Quantitative Information About Significant Unobservable Inputs Used in Level 3 Measurements	Significant Weighted  millions of dollars FV Unobservable Input Low High average (1) Assets Liabilities As at December 31, 2023 HFT derivatives – Natural  34 365 Third-party pricing $1.27 $16.25 $4.85 gas swaps, futures, forwards  and physical contracts  Total $ 34 $ 365 Net liability $ 331 As at December 31, 2022 Regulatory deferral – Physical $ 52 $ - Third-party pricing $5.79 $31.85 $12.27 natural gas purchases HFT derivatives – Power  4 1 Third-party pricing $43.24 $269.10 $138.79 swaps and physical contracts HFT derivatives – Natural  34 825 Third-party pricing $2.45 $33.88 $12.01 gas swaps, futures, forwards  and physical contracts  Total $ 90 $ 826 Net liability $ 736 (1) Unobservable inputs were weighted by the relative FV of the instruments.
Financial Liabilities not Measured at Fair Value on Consolidated Balance Sheets	Long-term debt is a financial liability not measured at FV on the Consolidated Balance Sheets. The balance consisted of the following: As at Carrying millions of dollars Amount FV Level 1 Level 2 Level 3 Total December 31, 2023 $ 18,365 $ 16,621 $ - $ 16,363 $ 258 $ 16,621 December 31, 2022 $ 16,318 $ 14,670 $ - $ 14,284 $ 386 $ 14,670

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- Definition

Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset.

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Tabular disclosure of information about fair value of asset and liability not measured at fair value.

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Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability.

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Tabular disclosure of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset) using recurring unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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