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Projected Benefit Payments (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2025 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan, Gross Projected Benefit Payments [Abstract] |  |  |  |  |
2025 |  |  | $ 235 |  |
2026 |  |  | 226 |  |
2027 |  |  | 229 |  |
2028 |  |  | 231 |  |
2029 |  |  | 237 |  |
2030-2034 |  |  | $ 1,137 |  |
Defined Benefit Plan, Net Projected Benefit Payments [Abstract] |  |  |  |  |
Target pension asset allocations (as a percent) |  |  | 100.00% | 100.00% |
Pension Plan [Member] | Equity Securities [Member] |  |  |  |  |
Defined Benefit Plan, Net Projected Benefit Payments [Abstract] |  |  |  |  |
Target pension asset allocations (as a percent) |  |  | 31.00% | 31.00% |
Pension Plan [Member] | Long-duration fixed income and interest rate swap securities |  |  |  |  |
Defined Benefit Plan, Net Projected Benefit Payments [Abstract] |  |  |  |  |
Target pension asset allocations (as a percent) |  |  | 38.00% | 38.00% |
Pension Plan [Member] | Short-to-intermediate fixed income securities |  |  |  |  |
Defined Benefit Plan, Net Projected Benefit Payments [Abstract] |  |  |  |  |
Target pension asset allocations (as a percent) |  |  | 9.00% | 9.00% |
Pension Plan [Member] | Alternative investments |  |  |  |  |
Defined Benefit Plan, Net Projected Benefit Payments [Abstract] |  |  |  |  |
Target pension asset allocations (as a percent) |  |  | 20.00% | 20.00% |
Pension Plan [Member] | Cash equivalents |  |  |  |  |
Defined Benefit Plan, Net Projected Benefit Payments [Abstract] |  |  |  |  |
Target pension asset allocations (as a percent) |  |  | 2.00% | 2.00% |
Pension Plan [Member] | Xcel Energy [Member] |  |  |  |  |
Defined Benefit Plan, Net Projected Benefit Payments [Abstract] |  |  |  |  |
Payment for Pension Benefits |  |  | $ 100 | $ 50 | $ 50
Pension Plan [Member] | Xcel Energy [Member] | Subsequent Event |  |  |  |  |
Defined Benefit Plan, Net Projected Benefit Payments [Abstract] |  |  |  |  |
Payment for Pension Benefits | $ 125 |  |  |  |
Other Postretirement Benefits Plan [Member] |  |  |  |  |
Defined Benefit Plan, Gross Projected Benefit Payments [Abstract] |  |  |  |  |
2025 |  |  | 44 |  |
2026 |  |  | 43 |  |
2027 |  |  | 42 |  |
2028 |  |  | 42 |  |
2029 |  |  | 40 |  |
2030-2034 |  |  | 187 |  |
Expected Medicare Part D Subsidies [Abstract] |  |  |  |  |
2023 |  |  | 3 |  |
2024 |  |  | 3 |  |
2025 |  |  | 3 |  |
2026 |  |  | 3 |  |
2027 |  |  | 3 |  |
2028-2032 |  |  | 18 |  |
Defined Benefit Plan, Net Projected Benefit Payments [Abstract] |  |  |  |  |
2023 |  |  | 41 |  |
2026 |  |  | 40 |  |
2027 |  |  | 39 |  |
2028 |  |  | 39 |  |
2029 |  |  | 37 |  |
2030-2034 |  |  | $ 169 |  |
Target pension asset allocations (as a percent) |  |  | 100.00% | 100.00% |
Other Postretirement Benefits Plan [Member] | Equity Securities [Member] |  |  |  |  |
Defined Benefit Plan, Net Projected Benefit Payments [Abstract] |  |  |  |  |
Target pension asset allocations (as a percent) |  |  | 25.00% | 9.00% |
Other Postretirement Benefits Plan [Member] | Long-duration fixed income and interest rate swap securities |  |  |  |  |
Defined Benefit Plan, Net Projected Benefit Payments [Abstract] |  |  |  |  |
Target pension asset allocations (as a percent) |  |  | 0.00% | 0.00% |
Other Postretirement Benefits Plan [Member] | Short-to-intermediate fixed income securities |  |  |  |  |
Defined Benefit Plan, Net Projected Benefit Payments [Abstract] |  |  |  |  |
Target pension asset allocations (as a percent) |  |  | 61.00% | 77.00% |
Other Postretirement Benefits Plan [Member] | Alternative investments |  |  |  |  |
Defined Benefit Plan, Net Projected Benefit Payments [Abstract] |  |  |  |  |
Target pension asset allocations (as a percent) |  |  | 11.00% | 13.00% |
Other Postretirement Benefits Plan [Member] | Cash equivalents |  |  |  |  |
Defined Benefit Plan, Net Projected Benefit Payments [Abstract] |  |  |  |  |
Target pension asset allocations (as a percent) |  |  | 3.00% | 1.00% |
Defined Benefit Plan, Overfunded Plan [Member] | Xcel Energy [Member] |  |  |  |  |
Defined Benefit Plan, Net Projected Benefit Payments [Abstract] |  |  |  |  |
Payment for Pension Benefits |  |  | $ 11 | $ 11 | $ 13
Defined Benefit Plan, Overfunded Plan [Member] | Xcel Energy [Member] | Subsequent Event |  |  |  |  |
Defined Benefit Plan, Net Projected Benefit Payments [Abstract] |  |  |  |  |
Payment for Pension Benefits |  | $ 8 |  |  |

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