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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]  
Asset Retirement Obligations
PSCo’s AROs were as follows:
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 distribution204 — 10 20 234 
Miscellaneous8 — — (7)1 
Total liability$422 $34 $19 $1 $476 
(a)Amounts incurred relate 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.
2021
(Millions 
of Dollars)		Jan. 1, 2021Accretion
Cash Flow Revisions (a)
Dec. 31, 2021
Electric
Steam, hydro and other production$137 $5 $10 $152 
Wind40 2 — 42 
Distribution15 1 — 16 
Natural gas
Transmission and distribution203 9 (8)204 
Miscellaneous3 — 5 8 
Common
Miscellaneous1 (1)— — 
Total liability$399 $16 $7 $422 
(a)In 2021, 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, 2022Dec. 31, 2021
PPAs$612 $600 
Other80 77 
Gross operating lease ROU assets692 677 
Accumulated amortization(255)(268)
Net operating lease ROU assets$437 $409 
Finance lease ROU assets:
(Millions of Dollars)Dec. 31, 2022Dec. 31, 2021
Gas storage facilities$160 $201 
Gas pipeline21 21 
Gross finance lease ROU assets181 222 
Accumulated amortization(64)(97)
Net finance lease ROU assets $117 $125 
Lease, Cost [Table Text Block]
Components of lease expense:
(Millions of Dollars)202220212020
Operating leases
PPA capacity payments$91 $102 $100 
Other operating leases (a)
20 16 13 
Total operating lease expense (b)
$111 $118 $113 
Finance leases
Amortization of ROU assets$4 $7 $7 
Interest expense on lease liability16 17 18 
Total finance lease expense$20 $24 $25 
(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 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, 2022:
(Millions of Dollars)
PPA (a) (b)
Operating
Leases
Other Operating
Leases
Total
Operating
Leases
Finance Leases
2023$80 $18 $98 $18 
202492 18 110 18 
202591 12 103 18 
202674 7 81 18 
202744 7 51 16 
Thereafter59 14 73 348 
Total minimum obligation440 76 516 436 
Interest component of obligation(49)(8)(57)(319)
Present value of minimum obligation$391 $68 459 117 
Less current portion(80)(3)
Noncurrent operating and finance lease liabilities$379 $114 
Weighted-average remaining lease term in years5.437.8
(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, 2022, 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
2023$3 
20243 
20253 
20261 
2027— 
Thereafter— 
Total$10 
Estimated Minimum Purchases Under Fuel Contracts
Estimated minimum purchases under these contracts as of Dec. 31, 2022:
(Millions of Dollars)CoalNatural gas supplyNatural gas storage and
transportation
2023$196 $504 $107 
202499 6 106 
202554 — 108 
202633 — 110 
202735 — 110 
Thereafter— — 475 
Total$417 $510 $1,016