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Benefit Plans and Other Postretirement Benefits (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jan. 31, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Components of Net Periodic Benefit Cost [Abstract] |  |  |  |  |  |
Settlement charge (b) |  |  |  | $ 6 |  | $ 62
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement, Recognized in Earnings |  |  |  | 1 |  | 8
Pension Plan [Member] |  |  |  |  |  |
Components of Net Periodic Benefit Cost [Abstract] |  |  |  |  |  |
Service cost |  |  | $ 19 | 19 | $ 57 | 57
Interest Cost | [1] |  | 38 | 37 | 116 | 113
Expected Return on Plan Assets | [1] |  | (52) | (52) | (156) | (155)
Amortization of Net Loss | [1] |  | 7 | 7 | 21 | 22
Net periodic benefit cost |  |  | 11 | 17 | 37 | 98
Effects of regulation |  |  | 3 | (1) | 7 | (37)
Net benefit cost recognized for financial reporting |  |  | 14 | 16 | 44 | 61
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | [1] |  | (1) | 0 | (1) | (1)
Settlement charge (b) | [2] |  | 0 | 6 | 0 | 62
Pension Plan [Member] | Parent Company |  |  |  |  |  |
Components of Net Periodic Benefit Cost [Abstract] |  |  |  |  |  |
Contributions to Xcel Energy's pension plans |  | $ 125 |  |  |  |
Other Postretirement Benefits Plan [Member] |  |  |  |  |  |
Components of Net Periodic Benefit Cost [Abstract] |  |  |  |  |  |
Service cost |  |  | 1 | 0 | 1 | 1
Interest Cost | [1] |  | 6 | 6 | 18 | 16
Expected Return on Plan Assets | [1] |  | (5) | (4) | (15) | (13)
Amortization of Net Loss | [1] |  | 1 | 0 | 3 | 1
Net periodic benefit cost |  |  | 3 | 2 | 7 | 5
Effects of regulation |  |  | 0 | 0 | 0 | 0
Net benefit cost recognized for financial reporting |  |  | 3 | 2 | 7 | 5
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | [1] |  | 0 | 0 | 0 | 0
Settlement charge (b) | [2] |  | $ 0 | $ 0 | $ 0 | $ 0
[1] | The components of net periodic cost other than the service cost component are included in the line item “Other income, net” in the consolidated statements of income or capitalized on the consolidated balance sheets as a regulatory asset.
[2] | A settlement charge is required when the amount of lump-sum distributions during the year is greater than the sum of the service and interest cost components of the annual net periodic pension cost. In the three and nine months ended Sept. 30, 2024, as a result of lump-sum distributions during the 2024 plan year, Xcel Energy recorded a pension settlement charge of $6 million and $62 million, respectively, the majority of which was not recognized due to the effects of regulation. A total of $1 million and $8 million was recognized in the consolidated statement of income for the three and nine months ended Sept. 30, 2024.

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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- Definition The total mount of net periodic benefit cost, before regulatory adjustments, for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain or loss, prior service cost or credit, transition asset or obligation, and gain or loss due to settlements or curtailments, before regulatory adjustments. + References No definition available. + Details
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