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Commitments and Contingencies (Tables)
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2024
Commitments and Contingencies Disclosure [Abstract]    
Lease, Cost
Components of lease expense:
Three Months Ended June 30
(Millions of Dollars)20242023
Operating leases
PPA capacity payments$13 $14 
Other operating leases (a)
1 1 
Total operating lease expense (b)
$14 $15 
(a)Includes immaterial short-term lease expense for 2024 and 2023.
(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)20242023
Operating leases
PPA capacity payments$26 $27 
Other operating leases (a)
2 2 
Total operating lease expense (b)
$28 $29 
(a)Includes immaterial short-term lease expense for 2024 and 2023.
(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, 2024:
(Millions of Dollars)PPA Operating LeasesOther Operating LeasesTotal Operating Leases
Total minimum obligation$428 $48 $476 
Interest component of obligation(77)(12)(89)
Present value of minimum obligation$351 $36 387 
Less current portion(33)
Noncurrent operating lease liabilities$354