Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2026

Commitments and Contingencies Disclosure [Abstract]

Lease, Cost

Components of lease expense:

	Three Months Ended March 31
(Millions of Dollars)	2026		2025
Operating leases
PPA capacity payments	$	11	$	9
Other operating leases (a)	1		1
Total operating lease expense	$	12	$	10

(a)Includes immaterial short-term lease expense.

Lessee, Operating Lease, Liability, Maturity

Commitments under operating leases as of March 31, 2026:

(Millions of Dollars)	PPA Operating Leases		Other Operating Leases		Total Operating Leases
Total minimum obligation	$	347	$	42	$	389
Interest component of obligation	(52)		(9)		(61)
Present value of minimum obligation	$	295	$	33	328
Less current portion					(36)
Noncurrent operating lease liabilities					$	292