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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, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
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]          
2021     17    
2022     8    
2023     8    
2024     9    
2025     10    
2026-2030     51    
Pension Plan [Member] | NSP Wisconsin [Member]          
Defined Benefit Plan, Net Projected Benefit Payments [Abstract]          
Payment for Pension Benefits     4 1 5
Pension Plan [Member] | Xcel Energy [Member]          
Defined Benefit Plan, Net Projected Benefit Payments [Abstract]          
Payment for Pension Benefits     50 50 131
Pension Plan [Member] | Subsequent Event          
Defined Benefit Plan, Net Projected Benefit Payments [Abstract]          
Payment for Pension Benefits $ 100        
Pension Plan [Member] | Subsequent Event | NSP Wisconsin [Member]          
Defined Benefit Plan, Net Projected Benefit Payments [Abstract]          
Payment for Pension Benefits $ 7        
Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan, Gross Projected Benefit Payments [Abstract]          
2021     1    
2022     1    
2023     1    
2024     1    
2025     1    
2026-2030     3    
Defined Benefit Plan, Overfunded Plan [Member] | NSP Wisconsin [Member]          
Defined Benefit Plan, Net Projected Benefit Payments [Abstract]          
Payment for Pension Benefits     0 1 2
Defined Benefit Plan, Overfunded Plan [Member] | Xcel Energy [Member]          
Defined Benefit Plan, Net Projected Benefit Payments [Abstract]          
Payment for Pension Benefits     $ 11 $ 13 $ 15
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   $ 11