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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]  
Asset Retirement Obligations
PSCo’s AROs were as follows:
2023
(Millions 
of Dollars)		Jan. 1,
2023		Accretion
Cash Flow Revisions (a)
Dec. 31, 2023
Electric
Steam, hydro and other production$180 $8 $— $188 
Wind44 2 — 46 
Distribution17 — — 17 
Natural gas
Transmission and distribution235 11 (114)132 
Total liability$476 $21 $(114)$383 
(a)In 2023, AROs were revised for changes in timing and estimates of cash flows. Changes in gas transmission and distribution AROs were primarily the result of changes to inflation and discount rate assumptions as well as updated mileage of gas lines and number of services.
2022
(Millions 
of Dollars)		Jan. 1, 2022
Amounts Incurred (a)
Accretion
Cash Flow Revisions (b)
Dec. 31, 2022
Electric
Steam, hydro and other production$152 $34 $6 $(12)$180 
Wind42 — 2 — 44 
Distribution16 — 1 — 17 
Natural gas
Transmission and distribution212 — 10 13 235 
Total liability$422 $34 $19 $1 $476 
(a)Amounts incurred related to steam production pond remediation costs.
(b)In 2022, AROs were revised for changes in timing and estimates of cash flows. Revisions in steam, hydro, and other production AROs primarily related to changes in cost estimates for remediation of ash containment facilities. Changes in gas transmission and distribution AROs were primarily related to changes in labor rates coupled with increased gas line mileage and number of services.
Assets and Liabilities, Lessee [Table Text Block]
Operating lease ROU assets:
(Millions of Dollars)Dec. 31, 2023Dec. 31, 2022
PPAs$623 $612 
Other112 80 
Gross operating lease ROU assets735 692 
Accumulated amortization(369)(255)
Net operating lease ROU assets$366 $437 
Finance lease ROU assets:
(Millions of Dollars)Dec. 31, 2023Dec. 31, 2022
Gas storage facilities$160 $160 
Gas pipeline21 21 
Gross finance lease ROU assets181 181 
Accumulated amortization(67)(64)
Net finance lease ROU assets $114 $117 
Lease, Cost [Table Text Block]
Components of lease expense:
(Millions of Dollars)202320222021
Operating leases
PPA capacity payments$89 $91 $102 
Other operating leases (a)
19 20 16 
Total operating lease expense (b)
$108 $111 $118 
Finance leases
Amortization of ROU assets$3 $4 $7 
Interest expense on lease liability15 16 17 
Total finance lease expense$18 $20 $24 
(a)Includes immaterial short-term lease expense of for 2023, 2022 and 2021.
(b)PPA capacity payments are included in electric fuel and purchased power on the consolidated statements of income. Expense for other operating leases is included in O&M expense and electric fuel and purchased power.
Operating and Finance Lease Commitments, Maturity
Commitments under operating and finance leases as of Dec. 31, 2023:
(Millions of Dollars)
PPA (a) (b)
Operating
Leases
Other Operating
Leases
Total
Operating
Leases
Finance Leases
2024$98 $19 $117 $18 
202597 12 109 18 
202674 8 82 18 
202744 8 52 16 
202820 8 28 15 
Thereafter39 6 45 333 
Total minimum obligation372 61 433 418 
Interest component of obligation(35)(6)(41)(304)
Present value of minimum obligation$337 $55 392 114 
Less current portion(102)(3)
Noncurrent operating and finance lease liabilities$290 $111 
Weighted-average remaining lease term in years4.636.8
(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 2032.
Estimated Future Payments for Capacity and Energy Pursuant to Purchased Power Agreements
At Dec. 31, 2023, the estimated future payments for capacity that PSCo is obligated to purchase pursuant to these executory contracts, subject to availability, were as follows:
(Millions of Dollars)Capacity
2024$3 
20253 
20263 
20271 
2028— 
Thereafter— 
Total$10 
Estimated Minimum Purchases Under Fuel Contracts
Estimated minimum purchases under these contracts as of Dec. 31, 2023:
(Millions of Dollars)CoalNatural gas supplyNatural gas storage and
transportation
2024$143 $221 $108 
202574 12 105 
202639 — 105 
202735 — 105 
2028— — 62 
Thereafter— — 382 
Total$291 $233 $867