v3.26.3
Commitment and Contingencies (Tables)
 9 Months Ended
Sep. 30, 2026
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Components of Lease Expense
Components of lease expense:
Three Months Ended Sept. 30
(Millions of Dollars)20262025
Operating leases
PPA capacity payments$18 $25 
Other operating leases (a)
4 2 
Total operating lease expense$22 $27 
Finance leases
Amortization of ROU assets$1 $1 
Interest expense on lease liability8 4 
Total finance lease expense$9 $5 
Nine Months Ended Sept. 30
(Millions of Dollars)20262025
Operating leases
PPA capacity payments$56 $68 
Other operating leases (a)
8 10 
Total operating lease expense$64 $78 
Finance leases
Amortization of ROU assets$3 $3 
Interest expense on lease liability22 11 
Total finance lease expense$25 $14 
(a)Includes immaterial short-term lease expense.
Schedule of Future Commitments under Operating Leases
Commitments under operating and finance leases as of Sept. 30, 2026:
(Millions of Dollars)PPA Operating LeasesOther Operating LeaseTotal Operating LeasesFinance Leases
Total minimum obligation$218 $336 $554 $496 
Interest component of obligation(28)(158)(186)(300)
Present value of minimum obligation$190 $178 368 196 
Less current portion(53)(4)
Noncurrent operating and finance lease liabilities$315 $192