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Leases (Tables)
 12 Months Ended
Dec. 31, 2023
Leases [Abstract]  
Schedule of Operating and Finance Leases Balance Sheet Location
Leases were presented on the consolidated balance sheets as follows.
($ millions)20232022 
Operating leases
Other assets51 43 
Accounts payable and other current liabilities(12)(9)
Other liabilities(39)(34)
Finance leases (1)
Regulatory assets137 132 
PPE, net205 206 
Accounts payable and other current liabilities(3)(2)
Finance leases(339)(336)
(1)    FortisBC Electric has a finance lease for the BPPA (Note 8), which relates to the sale of the output of the Brilliant hydroelectric plant, and for the Brilliant Terminal Station ("BTS"), which relates to the use of the station. Both agreements expire in 2056. In exchange for the specified take-or-pay amounts of power, the BPPA requires semi-annual payments based on a return on capital, which includes the original and ongoing capital cost, and related variable power purchase costs. The BTS requires semi-annual payments based on a charge related to the recovery of the capital cost of the BTS, and related variable operating costs.
Components of Lease Expense and Supplemental Lease Information
The components of lease expense were as follows.

($ millions)20232022 
Operating lease cost12 9 
Finance lease cost:
Amortization3 1 
Interest33 33 
Variable lease cost23 21 
Total lease cost71 64 
Supplemental lease information follows.
($ millions, except as indicated)2023 2022 
Weighted average remaining lease term (years)
Operating leases79
Finance leases3233
Weighted average discount rate (%)
Operating leases4.5 4.1 
Finance leases5.0 5.0 
Present Value of Minimum Finance Lease Payments
As at December 31, 2023, the present value of minimum lease payments was as follows.
($ millions)Operating
Leases		Finance
Leases		Total
202414 36 50 
202511 36 47 
202610 36 46 
20276 36 42 
20283 36 39 
Thereafter16 978 994 
60 1,158 1,218 
Less: Imputed interest(9)(816)(825)
Total lease obligations51 342 393 
Less: Current installments(12)(3)(15)
39 339 378 
Present Value of Minimum Operating Lease Payments
As at December 31, 2023, the present value of minimum lease payments was as follows.
($ millions)Operating
Leases		Finance
Leases		Total
202414 36 50 
202511 36 47 
202610 36 46 
20276 36 42 
20283 36 39 
Thereafter16 978 994 
60 1,158 1,218 
Less: Imputed interest(9)(816)(825)
Total lease obligations51 342 393 
Less: Current installments(12)(3)(15)
39 339 378