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Benefit Plans and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Jan. 31, 2025
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Components of Net Periodic Benefit Cost [Abstract]          
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement     $ (56.0)    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement, Recognized in Earnings     7.0    
Pension Plan [Member]          
Components of Net Periodic Benefit Cost [Abstract]          
Service cost   $ 19.0 19.0 $ 38.0 $ 38.0
Interest Cost [1]   39.0 38.0 78.0 76.0
Expected Return on Plan Assets [1]   (52.0) (51.0) (104.0) (103.0)
Amortization of Net Loss [1]   7.0 8.0 14.0 15.0
Net periodic benefit cost   13.0 69.0 26.0 81.0
Effects of regulation   2.0 (40.0) 4.0 (36.0)
Net benefit cost recognized for financial reporting   15.0 29.0 30.0 45.0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) [1]   0.0 (1.0) 0.0 (1.0)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement [2]   0.0 56.0 0.0 56.0
Pension Plan [Member] | Parent Company          
Components of Net Periodic Benefit Cost [Abstract]          
Contributions to Xcel Energy's pension plans $ 125.0        
Other Postretirement Benefits Plan [Member]          
Components of Net Periodic Benefit Cost [Abstract]          
Service cost   0.0 1.0 0.0 1.0
Interest Cost [1]   6.0 5.0 12.0 10.0
Expected Return on Plan Assets [1]   (5.0) (5.0) (10.0) (9.0)
Amortization of Net Loss [1]   1.0 0.0 2.0 1.0
Net periodic benefit cost   2.0 1.0 4.0 3.0
Effects of regulation   0.0 0.0 0.0 0.0
Net benefit cost recognized for financial reporting   2.0 1.0 4.0 3.0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) [1]   0.0 0.0 0.0 0.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement [2]   $ 0.0 $ 0.0 $ 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 second quarter of 2024, as a result of lump-sum distributions during the 2024 plan year, Xcel Energy recorded a pension settlement charge of $56 million, of which $7 million was recognized in the consolidated statement of income after considering the effects of regulation.