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Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 30, 2025
Commitments and Contingencies Disclosure [Abstract]  
Lease, Cost
Components of lease expense:
Three Months Ended June 30
(Millions of Dollars)20252024
Operating leases
PPA capacity payments$9 $13 
Other operating leases (a)
1 1 
Total operating lease expense (b)
$10 $14 
(a)Includes immaterial short-term lease expense.
(b)PPA capacity payments are included in electric fuel and purchased power on the statements of income. Expense for other operating leases is included in operating and maintenance expense and electric fuel and purchased power.
Six Months Ended June 30
(Millions of Dollars)20252024
Operating leases
PPA capacity payments$18 $26 
Other operating leases (a)
2 2 
Total operating lease expense (b)
$20 $28 
(a)Includes immaterial short-term lease expense.
(b)PPA capacity payments are included in electric fuel and purchased power on the statements of income. Expense for other operating leases is included in operating and maintenance expense and electric fuel and purchased power.
Lessee, Operating Lease, Liability, Maturity
Commitments under operating leases as of June 30, 2025:
(Millions of Dollars)PPA Operating LeasesOther Operating LeasesTotal Operating Leases
Total minimum obligation$381 $45 $426 
Interest component of obligation(62)(10)(72)
Present value of minimum obligation$319 $35 354 
Less current portion(35)
Noncurrent operating lease liabilities$319