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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]  
Asset Retirement Obligations
2022
(Millions of Dollars)Jan. 1, 2022Accretion
Cash Flow Revisions (a)
Dec. 31, 2022
Electric
Steam and other production$54 $3 $26 $83 
Wind52 2 — 54 
Distribution10 — — 10 
Total liability$116 $5 $26 $147 
(a)In 2022, AROs were revised for changes in estimates of cash flows. Revisions in steam and other production AROs primarily related to changes in costs for steam production ponds remediation.
2021
(Millions of Dollars)Jan. 1, 2021Accretion
Dec. 31, 2021 (a)
Electric
Steam and other production$52 $2 $54 
Wind50 2 52 
Distribution10 — 10 
Total liability$112 $4 $116 
(a)No AROs were revised in 2021.
Assets and Liabilities, Lessee [Table Text Block]
Operating lease ROU assets:
(Millions of Dollars)Dec. 31, 2022Dec. 31, 2021
PPAs$500 $500 
Other44 45 
Gross operating lease ROU assets544 545 
Accumulated amortization(110)(82)
Net operating lease ROU assets$434 $463 
Lease, Cost [Table Text Block]
Components of lease expense:
(Millions of Dollars)202220212020
Operating leases
PPA capacity payments$53 $53 $48 
Other operating leases (a)
4 4 3 
Total operating lease expense (b)
$57 $57 $51 
(a)Includes short-term lease expense of $1 million for 2022, 2021 and 2020.
(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 O&M expense.
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
Commitments under operating leases as of Dec. 31, 2022:
(Millions of Dollars)
PPA (a) (b)
Operating
Leases
Other Operating
Leases
Total
Operating
Leases
2023$46 $3 $49 
202446 3 49 
202546 4 50 
202646 4 50 
202746 4 50 
Thereafter266 36 302 
Total minimum obligation496 54 550 
Interest component of obligation(102)(14)(116)
Present value of minimum obligation394 40 434 
Less current portion(31)
Noncurrent operating and finance lease liabilities$403 
Weighted-average remaining lease term in years11
(a)Amounts do not include PPAs accounted for as executory contracts and/or contingent payments, such as energy payments on renewable PPAs.
(b)PPA operating leases contractually expire at various dates through 2033.
Estimated Future Payments for Capacity and Energy Pursuant to Purchased Power Agreements
At Dec. 31, 2022, the estimated future payments for capacity that SPS is obligated to purchase pursuant to these executory contracts, subject to availability, were as follows:
(Millions of Dollars)Capacity
2023$13 
20246 
2025— 
2026— 
2027— 
Thereafter— 
Total$19 
Estimated Minimum Purchases Under Fuel Contracts
Estimated minimum purchases under these contracts as of Dec. 31, 2022:
(Millions of Dollars)CoalNatural gas
supply		Natural gas
storage and
transportation
2023$201 $33 30 
2024133 — 16 
202518 — 12 
202619 — 6 
202719 — 6 
Thereafter— — 8 
Total$390 $33 $78