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Benefit Plans and Other Postretirement Benefits, 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
Defined Benefit Plan, Net Projected Benefit Payments [Abstract]          
Defined Contribution Plan, Administrative Expense     $ 2 $ 2 $ 2
Pension Plan [Member]          
Defined Benefit Plan, Gross Projected Benefit Payments [Abstract]          
2025     10    
2026     8    
2027     9    
2028     10    
2029     11    
2030-2034     50    
Pension Plan [Member] | NSP Wisconsin [Member]          
Defined Benefit Plan, Net Projected Benefit Payments [Abstract]          
Payment for Pension Benefits     7 4 1
Pension Plan [Member] | Xcel Energy [Member]          
Defined Benefit Plan, Net Projected Benefit Payments [Abstract]          
Payment for Pension Benefits     100 50 50
Pension Plan [Member] | Subsequent Event          
Defined Benefit Plan, Net Projected Benefit Payments [Abstract]          
Payment for Pension Benefits $ 125        
Pension Plan [Member] | Subsequent Event | NSP Wisconsin [Member]          
Defined Benefit Plan, Net Projected Benefit Payments [Abstract]          
Payment for Pension Benefits $ 9        
Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan, Gross Projected Benefit Payments [Abstract]          
2025 [1]     1    
2026 [1]     1    
2027 [1]     1    
2028 [1]     1    
2029 [1]     1    
2030-2034 [1]     3    
Defined Benefit Plan, Overfunded Plan [Member] | NSP Wisconsin [Member]          
Defined Benefit Plan, Net Projected Benefit Payments [Abstract]          
Payment for Pension Benefits     1   1
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] | Subsequent Event | NSP Wisconsin [Member]          
Defined Benefit Plan, Net Projected Benefit Payments [Abstract]          
Payment for Pension Benefits   $ 1      
Defined Benefit Plan, Overfunded Plan [Member] | Subsequent Event | Xcel Energy [Member]          
Defined Benefit Plan, Net Projected Benefit Payments [Abstract]          
Payment for Pension Benefits   $ 8      
[1] Amount is reported net of expected Medicare Part D subsidies, which are immaterial.