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Benefit Plans and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Components of Net Periodic Benefit Cost [Abstract]    
Operating and maintenance expenses $ 686 $ 605
Pension Plan [Member]    
Components of Net Periodic Benefit Cost [Abstract]    
Service cost 19 19
Interest Cost [1] 39 38
Expected Return on Plan Assets [1] (52) (52)
Amortization of Net Loss [1] 7 7
Net periodic benefit cost 13 12
Effects of regulation 2 4
Net benefit cost recognized for financial reporting 15 16
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 0 0
Interest Cost [1] 6 5
Expected Return on Plan Assets [1] (5) (4)
Amortization of Net Loss [1] 1 1
Net periodic benefit cost 2 2
Effects of regulation 0 0
Net benefit cost recognized for financial reporting $ 2 $ 2
[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