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AROs (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |  |
Beginning balance |  | $ 3,380 |  | $ 3,151 |
Amounts Incurred |  | 10 | [1] | 59 | [2]
Amounts Settled |  | (1) |  |  |
Accretion |  | 154 |  | 148 |
Cash flow revisions |  | (325) | [3] | 22 | [4]
Ending balance |  | 3,218 |  | 3,380 |
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |  |
Decommissioning fund investments |  | 3,211 |  | 2,882 |
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | NSP Minnesota |  |  |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |  |
Decommissioning fund investments |  | 3,200 |  | 2,900 |
Electric Plant Nuclear Production Decommissioning |  |  |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |  |
Beginning balance |  | 2,160 |  | 2,056 |
Amounts Incurred |  | 0 | [1] | 0 | [2]
Amounts Settled |  | 0 |  |  |
Accretion |  | 105 |  | 104 |
Cash flow revisions |  | (158) | [3] | 0 | [4]
Ending balance |  | 2,107 |  | 2,160 |
Electric Plant Wind Production |  |  |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |  |
Beginning balance |  | 514 |  | 478 |
Amounts Incurred |  | 10 | [1] | 25 | [2]
Amounts Settled |  | 0 |  |  |
Accretion |  | 19 |  | 19 |
Cash flow revisions |  | (17) | [3] | (8) | [4]
Ending balance |  | 526 |  | 514 |
Electric Plant Steam, Hydro and Other Production Asbestos |  |  |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |  |
Beginning balance |  | 348 |  | 288 |
Amounts Incurred |  | 0 | [1] | 34 | [2]
Amounts Settled |  | (1) |  |  |
Accretion |  | 15 |  | 12 |
Cash flow revisions |  | (1) | [3] | 14 | [4]
Ending balance |  | 361 |  | 348 |
Electric Plant Electric Distribution |  |  |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |  |
Beginning balance |  | 48 |  | 47 |
Amounts Incurred |  | 0 | [1] | 0 | [2]
Amounts Settled |  | 0 |  |  |
Accretion |  | 1 |  | 1 |
Cash flow revisions |  | 0 | [3] | 0 | [4]
Ending balance |  | 49 |  | 48 |
Natural Gas Plant Gas Transmission and Distribution |  |  |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |  |
Beginning balance | [5] | 307 |  | 279 |
Amounts Incurred |  | 0 | [1] | 0 | [2],[5]
Amounts Settled |  |  |  |  |
Accretion |  | 14 |  | 12 | [5]
Cash flow revisions |  | (149) | [3] | 16 | [4],[5]
Ending balance |  | 172 |  | 307 | [5]
Common and Other Property Common Miscellaneous |  |  |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |  |
Beginning balance |  | 3 |  | 3 |
Amounts Incurred |  | 0 | [1] | 0 | [2]
Amounts Settled |  | 0 |  |  |
Accretion |  | 0 |  | 0 |
Cash flow revisions |  | 0 | [3] | 0 | [4]
Ending balance |  | $ 3 |  | $ 3 |
[1] | Amounts incurred relate to the Northern Wind farm placed in service in NSP-Minnesota.
[2] | Amounts incurred related to the wind farms placed in service in 2022 for NSP-Minnesota (Dakota Range and Rock Aetna) and steam production pond remediation costs for PSCo.
[3] | In 2023, AROs were revised for changes in timing and estimates of cash flows. Revisions in wind and nuclear AROs were primarily incurred due to changes in useful lives. Changes in gas transmission and distribution AROs were a result of updated gas line mileage and number of services, as well as changes to inflation and discount rate assumptions.
[4] | In 2022, AROs were revised for changes in timing and estimates of cash flows. Revisions in steam, hydro and other production AROs were 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.
[5] | Prior periods have been reclassified to conform with current year presentation.

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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 25 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481999/410-20-25-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + Details
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- Definition Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481879/410-20-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + Details
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- Definition Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + Details
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