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Benefit Plans and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended
Jan. 31, 2023
Mar. 31, 2023
Mar. 31, 2022
Components of Net Periodic Benefit Cost [Abstract]      
Operating and maintenance expenses   $ 650 $ 602
Pension Plan [Member]      
Components of Net Periodic Benefit Cost [Abstract]      
Service cost   18 24
Interest Cost [1]   40 27
Expected Return on Plan Assets [1]   (52) (52)
Amortization of Prior Service Credit [1]   0 0
Amortization of Net Loss [1]   5 19
Net periodic benefit cost (credit)   11 17
Effects of regulation   5 5
Net benefit cost (credit) recognized for financial reporting   16 22
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement [2]   0 (1)
Operating and maintenance expenses   1  
Pension Plan [Member] | Parent Company      
Components of Net Periodic Benefit Cost [Abstract]      
Contributions to Xcel Energy's pension plans $ 50    
Other Postretirement Benefits Plan [Member]      
Components of Net Periodic Benefit Cost [Abstract]      
Service cost   0 0
Interest Cost [1]   5 4
Expected Return on Plan Assets [1]   (4) (4)
Amortization of Prior Service Credit [1]   0 (2)
Amortization of Net Loss [1]   1 1
Net periodic benefit cost (credit)   2 (1)
Effects of regulation   0 1
Net benefit cost (credit) recognized for financial reporting   2 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement [2]   $ 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] In the first quarter of 2022, Xcel Energy recognized $1 million in settlement charge true-ups related to the fourth quarter of 2021