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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]  
Operating and Finance Lease Commitments, Maturity
Commitments under operating and finance leases as of Dec. 31, 2020:
(Millions of Dollars)
PPA (a) (b)
Operating
Leases
Other Operating
Leases
Total
Operating
Leases
Finance Leases
2021$101 $15 $116 $24 
202284 15 99 21 
202370 10 80 20 
202463 10 73 20 
202563 5 68 19 
Thereafter163 12 175 381 
Total minimum obligation544 67 611 485 
Interest component of obligation(74)(8)(82)(352)
Present value of minimum obligation$470 $59 529 133 
Less current portion(97)(7)
Noncurrent operating and finance lease liabilities$432 $126 
Weighted-average remaining lease term in years7.138.0
(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.
Assets and Liabilities, Lessee [Table Text Block]
Operating lease ROU assets:
(Millions of Dollars)Dec. 31, 2020Dec. 31, 2019
PPAs$591 $585 
Other68 69 
Gross operating lease ROU assets659 654 
Accumulated amortization(159)(80)
Net operating lease ROU assets$500 $574 
Finance lease ROU assets:
(Millions of Dollars)Dec. 31, 2020Dec. 31, 2019
Gas storage facilities$201 $200 
Gas pipeline21 21 
Gross finance lease ROU assets222 221 
Accumulated amortization(90)(82)
Net finance lease ROU assets $132 $139 
Estimated Minimum Purchases Under Fuel Contracts
Estimated minimum purchases under these contracts as of Dec. 31, 2020:
(Millions of Dollars)CoalNatural gas supplyNatural gas storage and
transportation
2021$132 $354 $116 
202261 119 115 
202322 54 67 
202422 3 37 
202523 — 36 
Thereafter47 — 475 
Total$307 $530 $846 
Estimated Future Payments for Capacity and Energy Pursuant to Purchased Power Agreements
At Dec. 31, 2020, 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
2021$3 
20223 
20233 
20243 
20253 
Thereafter5 
Total$20 
Asset Retirement Obligations
PSCo’s AROs were as follows:
2020
(Millions 
of Dollars)		Jan. 1,
2020
Amounts Incurred (a)
Amounts Settled (b)
Accretion
Cash Flow Revisions (c)
Dec. 31, 2020
Electric
Steam, hydro and other production$100 $— $— $4 $33 $137 
Wind16 26 (3)1 — 40 
Distribution14 — — 1 — 15 
Natural gas
Transmission and distribution190 — — 8 5 203 
Miscellaneous3 — — — — 3 
Common
Miscellaneous1 — — — — 1 
Total liability$324 $26 $(3)$14 $38 $399 
(a)Amounts incurred related to the Cheyenne Ridge wind farm placed in service in 2020.
(b)Amounts settled related to removal of wind facilities.
(c)In 2020, 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 ash containment facilities.
2019
(Millions 
of Dollars)		Jan. 1, 2019Accretion
Cash Flow Revisions (a)
Dec. 31, 2019 (b)
Electric
Steam, hydro and other production$102 $5 $(7)$100 
Wind14 1 1 16 
Distribution13 1 — 14 
Miscellaneous3 — (3)— 
Natural gas
Transmission and distribution201 9 (20)190 
Miscellaneous4 — (1)3 
Common
Miscellaneous1 — — 1 
Total liability$338 $16 $(30)$324 
(a)In 2019, AROs were revised for changes in timing and estimates of cash flows. Changes in gas transmission and distribution AROs were primarily related to increased gas line mileage and number of services, which were more than offset by decreased inflation rates. Revisions in steam, hydro, and other production AROs primarily related to changes in cost estimates for pond remediation.
(b)There were no ARO amounts incurred or settled in 2019.
Lease, Cost [Table Text Block]
Components of lease expense:
(Millions of Dollars)202020192018
Operating leases
PPA capacity payments$100 $98 $97 
Other operating leases (a)
13 14 14 
Total operating lease expense (b)
$113 $112 $111 
Finance leases
Amortization of ROU assets$7 $6 $6 
Interest expense on lease liability18 19 19 
Total finance lease expense$25 $25 $25 
(a)Includes short-term lease expense of $1 million, $2 million and $1 million for 2020, 2019 and 2018, respectively.
(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.