v3.26.3
Benefit Plans and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2026
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Pension Plan [Member]          
Components of Net Periodic Benefit Cost [Abstract]          
Service cost   $ 20 $ 19 $ 60 $ 57
Interest Cost [1]   39 38 117 116
Expected Return on Plan Assets [1]   (50) (52) (150) (156)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) [1]   0 (1) (1) (1)
Amortization of Net Loss [1]   12 7 34 21
Net periodic benefit cost   21 11 60 37
Effects of regulation   5 3 4 7
Net benefit cost recognized for financial reporting   26 14 64 44
Pension Plan [Member] | Parent Company          
Components of Net Periodic Benefit Cost [Abstract]          
Contributions to Xcel Energy's pension plans $ 75        
Other Postretirement Benefits Plan [Member]          
Components of Net Periodic Benefit Cost [Abstract]          
Service cost   1 1 2 1
Interest Cost [1]   5 6 17 18
Expected Return on Plan Assets [1]   (5) (5) (15) (15)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) [1]   0 0 0 0
Amortization of Net Loss [1]   2 1 4 3
Net periodic benefit cost   3 3 8 7
Effects of regulation   0 0 0 0
Net benefit cost recognized for financial reporting   $ 3 $ 3 $ 8 $ 7
[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.