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AROs (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |
Beginning balance | $ 3,218 |  | $ 3,380 |
Amounts Incurred | 109 | [1] | 10 | [2]
Amounts Settled | (6) |  | (1) |
Accretion | 153 |  | 154 |
Cash flow revisions | 239 | [3] | (325) | [4]
Ending balance | 3,713 |  | 3,218 |
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |
Decommissioning fund investments | 3,494 | [5] | 3,211 | [6]
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | NSP Minnesota |  |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |
Decommissioning fund investments | 3,500 |  | 3,200 |
Electric Plant Nuclear Production Decommissioning |  |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |
Beginning balance | 2,107 |  | 2,160 |
Amounts Incurred | 0 | [1] | 0 | [2]
Amounts Settled | 0 |  | 0 |
Accretion | 106 |  | 105 |
Cash flow revisions | 263 | [3] | (158) | [4]
Ending balance | 2,476 |  | 2,107 |
Electric Plant Wind Production |  |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |
Beginning balance | 526 |  | 514 |
Amounts Incurred | 0 | [1] | 10 | [2]
Amounts Settled | 0 |  | 0 |
Accretion | 19 |  | 19 |
Cash flow revisions | (36) | [3] | (17) | [4]
Ending balance | 509 |  | 526 |
Electric Plant Steam, Hydro and Other Production Asbestos |  |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |
Beginning balance | 361 |  | 348 |
Amounts Incurred | 109 | [1] | 0 | [2]
Amounts Settled | (6) |  | (1) |
Accretion | 18 |  | 15 |
Cash flow revisions | 13 | [3] | (1) | [4]
Ending balance | 495 |  | 361 |
Electric Plant Electric Distribution |  |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |
Beginning balance | 49 |  | 48 |
Amounts Incurred | 0 | [1] | 0 | [2]
Amounts Settled | 0 |  | 0 |
Accretion | 2 |  | 1 |
Cash flow revisions | 0 | [3] | 0 | [4]
Ending balance | 51 |  | 49 |
Natural Gas Plant Gas Transmission and Distribution |  |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |
Beginning balance | 172 |  | 307 |
Amounts Incurred | 0 | [1] | 0 | [2]
Amounts Settled | 0 |  | 0 |
Accretion | 8 |  | 14 |
Cash flow revisions | (1) | [3] | (149) | [4]
Ending balance | 179 |  | 172 |
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 |  | 0 |
Accretion | 0 |  | 0 |
Cash flow revisions | 0 | [3] | 0 | [4]
Ending balance | $ 3 |  | $ 3 |
[1] | Amounts incurred largely pertain to CCR coal ash regulations and new obligations associated with Sherco Solar Unit 1 , which was placed in service in 2024.
[2] | Amounts incurred relate to the Northern Wind farm placed in service in NSP-Minnesota.
[3] | In 2024, AROs were revised for changes in timing and estimates of cash flows. Changes were driven by updated assumptions in the NSP-Minnesota nuclear decommissioning triennial filing coupled with discount rate and escalation rate changes. Wind, steam, hydro and other production AROs were revised due to the results of the 2024 dismantling studies and changes in cost estimates to remediate ash containment facilities.
[4] | 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.
[5] | Reported in nuclear decommissioning fund and other investments on the consolidated balance sheets, which also includes $246 million of equity method investments and $156 million of rabbi trust assets and other miscellaneous investments.
[6] | Reported in nuclear decommissioning fund and other investments on the consolidated balance sheets, which also includes $244 million of equity investments in unconsolidated subsidiaries and $144 million of rabbi trust assets and other miscellaneous investments.

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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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- Definition The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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