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Share-Based Compensation Expense (Details) - USD ($) shares in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Share-Based Compensation Expense [Abstract] |  |  |  |
Granted (in shares) |  | 658 | 586 | 395
Compensation cost for share-based awards | [1] | $ 30 | $ 27 | $ 36
Tax benefit recognized in income |  | 8 | 7 | 9
Unrecognized compensation cost related to nonvested share-based compensation awards |  | $ 38 |  |
Weighted-average period for recognition of unrecognized compensation cost related to nonvested share-based compensation awards (in years) |  | 1 year 8 months 12 days |  |
Compensation Related Costs [Abstract] |  |  |  |
Compensation costs for share-based payments included in O&M |  | $ 33 | 25 | 20
Compensation costs for share-based payments included in O&M |  | $ 33 | $ 25 | $ 20
Service-based awards [Member] |  |  |  |
Share-Based Compensation Expense [Abstract] |  |  |  |
Granted (in shares) |  | 500 | 400 | 200
Service-based awards [Member] | Xcel Energy Inc. 2015 Omnibus Incentive Plan [Member] |  |  |  |
Compensation Related Costs [Abstract] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized |  | 6,000 |  |
[1] | Compensation costs for share-based payments are included in O&M expense. Amount for equity awards (non-cash) was $33 million, $25 million and $20 million in 2024, 2023 and 2022, respectively.

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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