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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]  
Asset Retirement Obligations
SPS’ AROs were as follows:
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)There were no ARO amounts incurred, settled or revised in 2021.
2020
(Millions of 
Dollars)		Jan. 1, 2020
Amounts Incurred (a)
Amounts Settled (b)
Accretion
Dec. 31, 2020 (c)
Electric
Steam and other production$51 $— $(2)$3 $52 
Wind16 33 — 1 50 
Distribution10 — — — 10 
Total liability$77 $33 $(2)$4 $112 
(a)Amounts incurred related to the Sagamore wind farm placed in service in 2020.
(b)Amounts settled related to asbestos abatement projects.
(c)No AROs were revised in 2020.
Assets and Liabilities, Lessee [Table Text Block]
Operating lease ROU assets:
(Millions of Dollars)Dec. 31, 2021Dec. 31, 2020
PPAs$500 $500 
Other45 50 
Gross operating lease ROU assets545 550 
Accumulated amortization(82)(58)
Net operating lease ROU assets$463 $492 
Lease, Cost [Table Text Block]
Components of lease expense:
(Millions of Dollars)202120202019
Operating leases
PPA capacity payments$53 $48 $48 
Other operating leases (a)
4 3 5 
Total operating lease expense (b)
$57 $51 $53 
(a)Includes short-term lease expense of $1 million, $1 million and $2 million for 2021, 2020 and 2019, 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 O&M expense.
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
Commitments under operating leases as of Dec. 31, 2021:
(Millions of Dollars)
PPA (a) (b)
Operating
Leases
Other Operating
Leases
Total
Operating
Leases
2022$46 $3 $49 
202346 3 49 
202446 3 49 
202546 4 50 
202646 4 50 
Thereafter312 40 352 
Total minimum obligation542 57 599 
Interest component of obligation(120)(15)(135)
Present value of minimum obligation422 42 464 
Less current portion(30)
Noncurrent operating and finance lease liabilities$434 
Weighted-average remaining lease term in years12
(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, 2021, 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
2022$12 
202312 
20246 
2025— 
2026— 
Thereafter— 
Total
$30 
Estimated Minimum Purchases Under Fuel Contracts
Estimated minimum purchases under these contracts as of Dec. 31, 2021:
(Millions of Dollars)CoalNatural gas
supply		Natural gas
storage and
transportation
2022$211 $44 $32 
202350 — 29 
202431 — 16 
2025— — 12 
2026— — 6 
Thereafter— — 14 
Total$292 $44 $109