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Fair Value of Financial Instruments and Risk Management (Tables)
 12 Months Ended
Dec. 31, 2023
Fair Value Disclosures [Abstract]  
Fair Value Hierarchy
The following table presents derivative assets and liabilities that are accounted for at fair value on a recurring basis.
($ millions)
Level 1 (1)
Level 2 (1)
Level 3 (1)
Total
As at December 31, 2023
Assets
Energy contracts subject to regulatory deferral (2) (3)
— 49 — 49 
Energy contracts not subject to regulatory deferral (2)
— 6 — 6 
Foreign exchange contracts (2)
— 5 — 5 
Other investments (4)
145 — — 145 
145 60 — 205 
Liabilities
Energy contracts subject to regulatory deferral (3) (5)
— (209)— (209)
Energy contracts not subject to regulatory deferral (5)
— (3)— (3)
Total return and cross-currency interest rate swaps (5)
— (6)— (6)
— (218)— (218)
As at December 31, 2022
Assets
Energy contracts subject to regulatory deferral (2) (3)
— 304 — 304 
Energy contracts not subject to regulatory deferral (2)
— 49 — 49 
Other investments (4)
150 — — 150 
150 353 — 503 
Liabilities
Energy contracts subject to regulatory deferral (3) (5)
— (164)— (164)
Energy contracts not subject to regulatory deferral (5)
— (8)— (8)
Foreign exchange contracts, total return and cross-currency interest rate swaps (5)
— (26)— (26)
— (198)— (198)
(1)Under the hierarchy, fair value is determined using: (i) Level 1 - unadjusted quoted prices in active markets; (ii) Level 2 - other pricing inputs directly or indirectly observable in the marketplace; and (iii) Level 3 - unobservable inputs, used when observable inputs are not available. Classifications reflect the lowest level of input that is significant to the fair value measurement.
(2)Included in accounts receivable and other current assets or other assets
(3)Unrealized gains and losses arising from changes in fair value of these contracts are deferred as a regulatory asset or liability for recovery from, or refund to, customers in future rates as permitted by the regulators, with the exception of long-term wholesale trading contracts and certain gas swap contracts.
(4)Included in cash and cash equivalents and other assets
(5)Included in accounts payable and other current liabilities or other liabilities
Derivative Asset Contracts Under Master Netting Agreements and Collateral Positions The following table presents the potential offset of counterparty netting.
($ millions)
Gross Amount
Recognized In
Balance Sheet		Counterparty
Netting of
Energy Contracts		Cash Collateral
Posted/(Received)		Net Amount
As at December 31, 2023
Derivative assets55 (24)28 59 
Derivative liabilities(212)24 (1)(189)
As at December 31, 2022
Derivative assets353 (54)(7)292 
Derivative liabilities(172)54 — (118)
Derivative Liability Contracts Under Master Netting Agreements and Collateral Positions The following table presents the potential offset of counterparty netting.
($ millions)
Gross Amount
Recognized In
Balance Sheet		Counterparty
Netting of
Energy Contracts		Cash Collateral
Posted/(Received)		Net Amount
As at December 31, 2023
Derivative assets55 (24)28 59 
Derivative liabilities(212)24 (1)(189)
As at December 31, 2022
Derivative assets353 (54)(7)292 
Derivative liabilities(172)54 — (118)
Schedule of Volume of Derivative Activity
As at December 31, 2023, the Corporation had various energy contracts that will settle on various dates through 2029. The volumes related to electricity and natural gas derivatives are outlined below.
2023 2022 
Energy contracts subject to regulatory deferral (1)
Electricity swap contracts (GWh)
628 586 
Electricity power purchase contracts (GWh)
588 224 
Gas swap contracts (PJ)
228 185 
Gas supply contracts (PJ)
134 148 
Energy contracts not subject to regulatory deferral (1)
Wholesale trading contracts (GWh)
1,310 1,886 
Gas swap contracts (PJ)
3 34 
(1)GWh means gigawatt hours and PJ means petajoules