Commitments and Contingencies (Tables)

3 Months Ended

9 Months Ended

Sep. 30, 2022

Sep. 30, 2022

Commitments and Contingencies Disclosure [Abstract]

Lease, Cost

Components of lease expense:

	Three Months Ended Sept. 30
(Millions of Dollars)	2022		2021
Operating leases
PPA capacity payments	$	13	$	13
Other operating leases (a)	1		—
Total operating lease expense (b)	$	14	$	13

(a)Includes immaterial short-term lease expense for 2022 and 2021.

(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.

	Nine Months Ended Sept. 30
(Millions of Dollars)	2022		2021
Operating leases
PPA capacity payments	$	39	$	40
Other operating leases (a)	4		2
Total operating lease expense (b)	$	43	$	42

(a)Includes short-term lease expense of $1 million for 2022 and 2021, respectively.

(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 Sept. 30, 2022:

(Millions of Dollars)	PPA Operating Leases		Other Operating Leases		Total Operating Leases
Total minimum obligation	$	508	$	54	$	562
Interest component of obligation	(106)		(14)		(120)
Present value of minimum obligation	$	402	$	40	442
Less current portion					(31)
Noncurrent operating lease liabilities					$	411